la classe EventManager

J'ai ajoute la classe EventManager et ecrit certains choses comme
exemple dans la class Building
Merge remote-tracking branch 'origin/master'

Conflicts:
	Assembly-CSharp-vs.csproj
	Assembly-CSharp.csproj
	Crapcity-csharp.sln
	Crapcity.sln
Merge branch 'master' of ssh://github.com/RLejolivet/Crapcity

Conflicts:
	Assets/Scripts/GameLogic/Building.cs