Ajout de la classe GameManager
Merge remote-tracking branch 'origin/GameManager'

Conflicts:
	Battlestar Invader.v11.suo
	Battlestar/obj/Debug/Battlestar.csprojResolveAssemblyReference.cache
	Battlestar/obj/Debug/Battlestar.dll
	Battlestar/obj/Debug/Battlestar.pdb
	BattlestarInvader/obj/Debug/BattlestarInvader.csproj.GenerateResource.Cache
	BattlestarInvader/obj/Debug/BattlestarInvader.csprojResolveAssemblyReference.cache
	BattlestarInvader/obj/Debug/BattlestarInvader.exe
	BattlestarInvader/obj/Debug/BattlestarInvader.pdb
	BattlestarInvader/obj/Debug/DesignTimeResolveAssemblyReferencesInput.cache
	BattlestarInvader/obj/Debug/intermediatexaml/BattlestarInvader.exe
	BattlestarInvader/obj/Debug/intermediatexaml/BattlestarInvader.pdb
	HUD/obj/Debug/HUD.csprojResolveAssemblyReference.cache
	Screen/obj/Debug/Screen.csprojResolveAssemblyReference.cache
	Weapons/obj/Debug/Weapons.csprojResolveAssemblyReference.cache
	Weapons/obj/Debug/Weapons.dll
	Weapons/obj/Debug/Weapons.pdb