Some changes
Merge https://github.com/OzgurE/UntitledGameEngine

Conflicts:
	untitled Engine V0.2/core/AppGameState.cpp
	untitled Engine V0.2/include/AppGameState.h
	untitled Engine V0.2/include/GameState.h
	untitled Engine V0.2/sample/GamePlay.cpp
	untitled Engine V0.2/sample/GamePlay.h
	untitled Engine V0.2/sample/MenuState.cpp
	untitled Engine V0.2/sample/MenuState.h
	untitled Engine V0.2/sample/main.cpp