intellisense should work for variables in current file, open files and / or all GML files in folder

[johnathanz]

Is your feature request related to a problem? Please describe.
whenever, I'm reusing a variable that was declared in the current file, it's frustrating there's intellisense / auto-complete doesn't kick in.

However function names do appear when a . is typed. Which is great. Thanks

Describe the solution you'd like

1. Best option: gml-support could check all variables in GML files in current folder & subfolders
2. 2nd best option: extension checks all variable declarations in open files in VSCode
3. 3rd best option: extension checks all variable declarations in current file

Describe alternatives you've considered
Right now, I manually search for variable names that I use, and retype it in the current file.

Also, GML Bundle (extension) for Sublime Text 3 does show local variables.

It's possible this is an out of box feature for ST3, and not implemented as part of GML Bundle

Additional context
Here's a GIF of it in action where new_astroid variable was previously declared, but intellisense isn't kicking in