The state now inherit from Entity.
Merge branch 'refs/heads/develop' into feature/SwigWrapper

Conflicts:
	BaconBox/Core/State.h
Added a getState function in the Engine class.
Added a FlashEntityManagerClass.
Forgot an include macro.
Fixed an include macro.
Added the code that should allow adding a state on the stage in flash.
Fixed some small error in PlatformFlagger