otisserv: Display driving directions

[mike8643]

Description ( description of the refactor, including the goals it accomplishes.)
Does not include other changes there were in dev-c3 already to tie param "CustomMapBox" to navD, therefore I could not test outside of on dev-c3 branch
Added Navigation driving directions to the local nav web server.
Saves a lightweight json version of the navd mapbox routing pulling out unnecessary components.
Adds to the json, Current Destination and Current Step.
New tpl for javascript to display information on the screen.
After entering destination through webserver, driving directions will immediately show up.
If refreshed, webpage will display driving directions if param NavDestination is populated, in the case where the user enters the address directly onto the Comma device.
Displays Current Destination, and clearer step text while removing previous steps once completed.
Refreshes every 5 seconds for new data.
Known Limitations:
Does not decrease distance as you drive during that step, I did not want to add additional code to support this to make it lighter.
Without Comma device in the onroad state, entering new destination will not refresh destination or directions since navd does not attempt to pull new mapbox api until device is in the onroad state.
I am not a programmer by trade, this code works for me but can always be optimized.
Verification [](Explain how you tested the refactor for regressions.)
Works fine on my end during my testing period of over a week. Used mobile iOS safari browser as well as chrome loaded onto my infotainment system.

[mike8643]

Added code to support metric units based on the param "IsMetric"
Added code to default to showing driving directions only for prime subscribers.

[mike8643]

Added dark mode toggle. Default dark mode, set cookie for saved preference.
Reduced data transfer when updating directions throughout route. Helps when remotely viewing directions over mobile internet.