Update 0.2 brings sound and some improvements!

This is a minor update, I will make another update in March, for the regular addition of vehicles and tracks!

Here is the changelog:

1. Sound! There is now a nice menu background music, and engine sounds for the vehicles! No sound for crashes yet, and the engine sounds need a lot of improvements, but it's something already.
2. An intro when you launch the game!
3. MonsterBike and TriMonster had their center of gravity lowered, so that it's now fun to play with them. I've also changed their 3D models to match this new setting.
4. The beginning of a damage system: doors, bumpers and hood now get loose on collisions! Right now, only the Monster Truck has it.