Racer2D tweaks/fixes/feedback

[Alan-FGR]

• [x] TOP PRIORITY: Make sure paths work on Linux (capital letters)
• [ ] Update to use Time subsystem
• [ ] Tweak the truck to have more horsepower, less top speed
• [ ] Use front wheel for braking sounds
• [ ] Change center of gravity (is the API working for that? Didn't seem to)
• [ ] Use a rounded polygon collider for the vehicle
• [ ] Use the 2d lighting system
• [ ] Add the other characters from the asset pack
• [ ] Add more levels
• [ ] Add a main menu that allows you to select characters and levels
• [ ] Expose the settings from the Terrain class
• [ ] Add decent suspension sounds and a better engine sound
• [ ] Add more spacing between the decorations, make it configurable

Le gran finale

• [ ] Provide proper components for all the features usable in the editor, including terrain generator with visual feedback and whatnot

[Alan-FGR]

Update: Just updating to let whoever it may concern know that from my part this is waiting for some stuff here: https://github.com/AtomicGameEngine/AtomicGameEngine/issues/1197