add vpvl2FX prefix to fma/saturate/texture
added check APPLE_vertex_array_object
* added findEffectPath and deleteEffectRef method
* fixed a crash bug when scene is recreated by TwBar is not deleted
* createEffectRef now take std::string instead of IString
* removed effectFilePath from IApplicationContext interface
fixed a crash bug when undo buffer is not empty
renaming methods of IApplicationContext and inheritance