Add git symbols to project panel

[nesrve]

Release Notes:

• Added git symbols to the project panel, enable it in the project panel setting "git_symbol": { "enabled": true }

[iamnbutler]

Hey! Thanks for working on this – what happens when a long file name hits the symbol?

[Angelk90]

@evrensen467 : You could make it so that if a user instead of viewing the letter displays a symbol like the one seen below in the images: