CCSAXParser: Adding support to read-in pure xml TMX file
CCSAXParser: Adding support to read-in pure xml TMX file

* Data element buffer needs to be set accordingly

haithemaraissia/CocosSharp,MSylvia/CocosSharp,zmaruo/CocosSharp,TukekeSoft/CocosSharp,mono/CocosSharp,mono/CocosSharp,zmaruo/CocosSharp,haithemaraissia/CocosSharp,MSylvia/CocosSharp,TukekeSoft/CocosSharp