Cleanup of CCPrimitiveBatch:
Cleanup of CCPrimitiveBatch:

* renaming or private ivars to underscore prefix
* reorganising methods into logical groupings

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