Stubbed IsSdmcWriteable to always return writeable.
Merge pull request #328 from archshift/writeable

Stubbed IsSdmcWriteable to always return writeable.
Remove the glLoadGen bindings and switch to libepoxy. TODO: test what’d happen on MSVC.
citra: Add OpenGL configuration
citra_qt: Add OpenGL configuration
video_core: Make the OpenGL renderer work on GL 2.0+ and GLES 2.0+