Update gdb breakpointer file and some comment
- update gdb -x file, in which hold the breakpointer definitions
- make Android.mk's debug flag be open
- some comment to image.cpp
Improve Renderable's add IA and Texture logic
- make it check the remove_if result, in case no redundant call to erase
Bug fix
- all ElementOfRenderable's destructor will check it's enabled or not to call Disable(), since sometimes, some container will call its copy constructor to create a temp object, when the temp object is destroying, call Disable() will call it's Renderable pointer, but that's null at that time
- make Texture's pImage be clear, delete and assign to null after it has been used for upload the image pixels
Bug fix for Scene
- move the global's image object to scene's Load() function, since when Texture try to delete the image object, it will find it has no way to delete the global object's memory, since it's not new/malloc out