added desktop platform wrapper around use of CCInputState
added desktop platform wrapper around use of CCInputState

mono/cocos2d-xna,haithemaraissia/CocosSharp,netonjm/CocosSharp,zmaruo/CocosSharp,haithemaraissia/CocosSharp,MSylvia/CocosSharp,hig-ag/CocosSharp,netonjm/CocosSharp,hig-ag/CocosSharp,TukekeSoft/CocosSharp,MSylvia/CocosSharp,mono/CocosSharp,zmaruo/CocosSharp,TukekeSoft/CocosSharp,mono/CocosSharp,mono/cocos2d-xna