[HOpenGL] EXT_framebuffer_object support.

Hello all, I searched for current efforts on adding EXT_framebuffer_object support to HOpenGL but was unable to locate anything. I've added the very beginnings of EXT_framebuffer_object support. Attached (in theory) is the current patch. I've only added the bare minimum required to render to a 2D texture and am not sure if the style matches the current style. If the patch was stripped from this email the changes can be pulled from: http://www.tothepowerofdisco.com/repo/OpenGL Cheers, Corey O'Connor