fixes.inc feature flag

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It seems some people do not like that open.mp is directly based on fixes.inc. If you do not want its features, feel free to add a flag to disable them.

Here is a complete list of all the fixes from that include:

Name	Problem
GetPlayerColor	Returns "0" if "SetPlayerColor" has never been called.
FILTERSCRIPT	Despite the fact that is in every new script, many people dont' define "FILTERSCRIPT" where appropriate.
SpawnPlayer	Kills the player if they are in a vehicle.
SetPlayerName	Using "SetPlayerName" when the new name only differs from the old name in case does not alter the name at all.
GetPlayerSkin	Returns the new skin after "SetSpawnInfo" is called but before the player actually respawns to get the new skin.
GetWeaponName	Returns nothing for 18, 44, and 45.
SetPlayerWorldBounds	Aiming can bypass the edge.
TogglePlayerControllable	Other players see you moving on the spot.
HydraSniper	Entering military aircraft with a sniper rifle messes up views.
IsPlayerInCheckpoint	Function returns an undefined value if it is called before any other checkpoint functions are called to initialise the value.
IsPlayerInRaceCheckpoint	Function returns an undefined value if it is called before any other race checkpoint functions are called to initialise the value.
GetPlayerWeapon	Returns the old value after entering in a vehicle.
PutPlayerInVehicle	If this is used on a passenger the driver of their old vehicle doesn't see them in their new vehicle.
KEY_AIM	"KEY_AIM" isn't defined by default.
SetPlayerCheckpoint	If a checkpoint is already set it will use the size of that checkpoint instead of the new one.
SetPlayerRaceCheckpoint	If a checkpoint is already set it will use the size of that checkpoint instead of the new one.
TextDrawCreate	Crashes on a blank string.
TextDrawCreate_2	If the last character in the text is a space (" "), the text will all be blank.
TextDrawSetString	Crashes on a blank string and size greater than 1024.
TextDrawSetString_2	If the last character in the text is a space (" "), the text will all be blank.
CreatePlayerTextDraw	Crashes on a blank string.
CreatePlayerTextDraw_2	If the last character in the text is a space (" "), the text will all be blank.
PlayerTextDrawSetString	Crashes on a blank string and size greater than 1024.
PlayerTextDrawSetString_2	If the last character in the text is a space (" "), the text will all be blank.
AllowInteriorWeapons	Does nothing.
OnPlayerEnterVehicle	Crashes other players when people enter an invalid seat.
OnPlayerEnterVehicle_2	Crashes the server when hacks enter an invalid vehicle.
OnPlayerEnterVehicle_3	No player animation when trying to enter the driver door of a locked vehicle
AllowTeleport	0.3dRC9 removed "AllowPlayerTeleport" and "AllowAdminTeleport" in favour of "OnPlayerClickMap". Some scripts used the old code and.
SetPlayerSpecialAction	Removing jetpacks from players by setting their special action to 0 causes the sound to stay until death.
OnDialogResponse	Cheaters can spoof the dialogid they are using to respond to ones they can't actually see.
GetPlayerDialog	This function doesn't exist. Fixed for hidden dialogs.
PlayerDialogResponse	A player's dialog doesn't hide when the gamemode restarts, causing the server to print "Warning: PlayerDialogResponse PlayerId: 0 dialog ID doesn't match last sent dialog ID".
SetSpawnInfo	Kicks the player if "SpawnPlayer" is called before "SetSpawnInfo".
SetPlayerSkin	Breaks sitting on bikes.
HideMenuForPlayer	Crashes when passed an invalid menu ID.
valstr	Crashes on large numbers.
fclose	Crashes on an invalid handle.
fwrite	Crashes on an invalid handle.
fread	Crashes on an invalid handle.
fputchar	Crashes on an invalid handle.
fgetchar	Crashes on an invalid handle.
fblockwrite	Crashes on an invalid handle.
fblockread	Crashes on an invalid handle.
fseek	Crashes on an invalid handle.
flength	Crashes on an invalid handle.
file_inc	Includes or excludes all the file function fixes together (can cause major overhead).
SetPlayerAttachedObject	Doesn't remove objects when the mode ends.
OnPlayerDeath	Clients get stuck when they die with an animation applied.
strins	Ignores the "maxlength" parameter causing possible crashes.
IsPlayerConnected	Only uses the lower two bytes of a passed ID.
TrainExit	When getting out of a train entered by "PutPlayerInVehicle", the camera does not reset properly.
Kick	Calling "Kick" in "OnPlayerConnect" doesn't work properly.
OnVehicleMod	Crashes other players when invalid mods are applied.
random	Doesn't work with negative numbers.
sleep	Leaks bytes from the stack.
AddMenuItem	Crashes when passed an invalid menu ID.
SetMenuColumnHeader	Crashes when passed an invalid menu ID.
ShowMenuForPlayer	Crashes when passed an invalid menu ID.
HideMenuForPlayer	Crashes when passed an invalid menu ID.
HideMenuForPlayer_2	Ignores the "menuid" parameter.
DisableMenu	Crashes when passed an invalid menu ID.
DisableMenuRow	Crashes when passed an invalid menu ID.
Menus	All menu function fixes are included separately for major overhead.
GetPlayerMenu	Returns previous menu when none is displayed.
GetPlayerInterior	Always returns 0 for NPCs.
ClearAnimations	Use ClearAnimation while you are in a vehicle cause the player exit from it.
ClearAnimations_2	ClearAnimations doesn't do anything when the animation ends if we pass 1 for the freeze parameter in ApplyAnimation.
DriveBy	If you press KEY_CROUCH while you're passenger and if you are armed, the player start to aim; if you repress KEY_CROUCH the player don't return in vehicle.
SilentTeleport	If a vehicle teleports either by SetVehiclePos or enters an original samp interior if someone tries to enter it he will teleport silently along.
GangZoneCreate	Gang zones bug on the main map for players at certain angles relative to them.
SPECIAL_ACTION_PISSING	"SPECIAL_ACTION_PISSING" isn't defined by default.
IsValidVehicle	"IsValidVehicle" isn't defined by default.
ApplyAnimation	Passing an invalid animation library in ApplyAnimation causes a client crash for streamed in players.
ApplyAnimation_2	First time a library is used, it does nothing.
ApplyActorAnimation	Passing an invalid animation library in ApplyAnimation causes a client crash for streamed in players.
ApplyActorAnimation_2	First time a library is used, it does nothing.
OnPlayerSpawn	San Andreas deducts $100 from players.
GetGravity	"GetGravity" isn't defined by default.
gpci	"gpci" isn't defined by default.
Natives	Several natives are included by default, this enables or disables them all. Therefore this is an umbrella fix for several fixes.
OnPlayerConnect	This function isn't called for players when a filterscript starts.
OnPlayerDisconnect	This function isn't called for players when a filterscript ends.
GameText	Several styles do not display for the time specified.
GameTextStyles	San Andreas has fixed styles for area and vehicle names, but they are not included in the GameText styles list.
HideGameText	There is no "HideGameTextForXYZ" function.
ClearPlayerWorldBounds	There is no "ClearPlayerWorldBounds" function.
GetPlayerWorldBounds	There is no "GetPlayerWorldBounds" function.
WEAPONS	Some weapons are not defined by default.
BODYPARTS	The bodyparts to be used in OnPlayer(Take/Give)Damage are not defined by default
CAMERAMODES	The camera modes for GetPlayerCameraMode are not defined by default.
SetPlayerCamera	Using the camera functions directly after enabling spectator mode doesn't work.
SetPlayerTime	Using this function under "OnPlayerConnect" doesn't work.
OnPlayerRequestClass	Random blunts and bottles sometimes appear in class selection.
SetPlayerColor	If used under OnPlayerConnect, the affecting player will not see the color in the TAB menu.
FileMaths	You can write gibberish like "File:a; ++a;".
GetPlayerWeaponData	Old weapons with no ammo left are still returned.
strcmp	Return 0 if anyone of the string is empty.
GetPVarString	Wrong symbol code for symbols with code 128 and above.
GetSVarString	Wrong symbol code for symbols with code 128 and above.
toupper	Not working on Linux for symbols with code 128 and above.
tolower	Not working on Linux for symbols with code 128 and above.
PassengerSeating	Teleporting player to passenger seat after delay.
GogglesSync	Visual effects show for all players.
GetPlayerPoolSize	Returns "0" even if there are no players on the server.
SetPlayerPos	Using this function on skydiving players kills them.
GetPlayerAmmo	Returns erroneous values over 32767 and under -32768 due to overflow.
JIT	Can't easily determine if the script is JIT compiled.
OS	Can't easily determine what OS the script is running on.
const	Some SA-MP natives don't use "const" when they could.
VEHICLES	The vehicle models IDs are not defined by default.
GetPlayerWeather	This function doesn't exist.
GetWeather	This function doesn't exist.
GetWorldTime	This function doesn't exist.
GetServerVarAsString	Crashes on unknown string variables.
GetServerVarAsInt	Crashes on unknown int variables.
GetServerVarAsBool	Crashes on unknown boolean variables.
GetServerVarAsFloat	Doesn't even exist.
tabsize	Some people still use tabsize 0.
OnRconCommand	Is not called in the gamemode unless first called in a filterscript.
OnClientCheckResponse	Is not called in the gamemode ever.
GetMaxPlayers	If this is > MAX_PLAYERS, can cause OOBs in code.
BypassDialog	You can type commands and move while in dialogs.
SetTimer	Valid timers can return ID 0.
main	Gamemodes without this function give a console error.
OnVehicleSpawn	Colour -1 isn't synced.
AttachTrailerToVehicle	When trailerid is equal to vehicleid and passenger is in vehicleid, it starts spinning.
GetVehicleComponentInSlot	The function doesn't work for CARMODTYPE_STEREO. Both front bull bars and front bumper components are saved in the CARMODTYPE_FRONT_BUMPER slot. If a vehicle has both of them installed, this function will only return the one which was installed last. Both rear bull bars and rear bumper components are saved in the CARMODTYPE_REAR_BUMPER slot. If a vehicle has both of them installed, this function will only return the one which was installed last.
API	fixes.inc isn't intended to extend the SA:MP API, but has a lot of information internally that can be useful to other scripts. By not exposing this data, we complicate and bloat scripts by requiring them to re-implement said functionality.
floatfract	Incorrect on negative numbers.
strfind	The function is prone to OOB access when the search start index is negative.
strdel	The function is prone to OOB access when the index of the first character to remove is negative.
CallLocalFunction	Isn't defined in NPC modes.
deconst	Un-const-correct - uses const but shouldn't.
Streamer_RemoveIntData	Int data functions expect more parameters than they specify.
Streamer_HasIntData	Int data functions expect more parameters than they specify.
default	Many functions are missing default values for string lengths.
limit_tags	Some limits, like MAX_MENUS are untagged, so can't be used properly.
bool_tags	Many true/false parameters use 1/0 with no bool: tag.
TEXT_DRAW_ALIGN	The alignment modes for TextDrawAlignment are not defined by default.
TEXT_DRAW_FONT	The fonts for TextDrawFont are not defined by default.
GetPlayerKeys	GetPlayerKeys and OnPlayerKeyStateChange don't actually deal with "keys", but "actions". The defines don't correspond to real keyboard inputs, but bound game commands. This is one of the biggest sources of confusion, even amongst intermediate coders.
FORCE_SYNC	The sync modes for ApplyAnimation are not defined by default.
address_naught	When there are internal code errors that result in the wrong address being written to, more often than not that write clobbers whatever value is in address naught (0x00000000).
main2	main isn't called in filterscripts.
npcmodes	There's no way to specify NPC modes in server.cfg.
fgetchar2	Has an extra value parameter.
memcpy	The index is meant to be an index in to source (in bytes) for where to read the data from; however, it is treated as an index (in bytes) for where to write the data to in dest.
ispacked	Returns false when the string is packed and starts with a symbol with code 128 and above.
SHA256	Is not good for using for passwords.

Once the flag disables all of them, and not before, we can merge it. Note that some features aren't actually implemented yet, so you'll need to keep up to date as they come in.