Remove shitty bugged prefabs
Add ground prefab
Changes to ground prefab
Add moto prefab
Add wall prefab
Add arena prefab
Change scene
Add input control classes (abstract + keyboard)
Merge remote-tracking branch 'project/master' into bastien_moto

Conflicts:
	Assets/CustomPrefabs/Ground.prefab
	Assets/Scenes/main_scene.unity
	Assets/Scripts/Moto/Movement.cs
Fix mistakes
Fix some bugs
Merge branch 'master' into bastien_moto

Conflicts:
	Assets/Scenes/main_scene.unity
	Assets/Scripts/Moto/Movement.cs