Added support for all remaining SurfaceFormat values in OpenGL
HalfVector2, HalfVector4, Rg32, Rgba64, Rgba1010102, Vector2, Vector4, HdrBlendable, NormalizedByte2, NormalizedByte4.
Merge pull request #1686 from slygamer/surface-formats

Added support for all remaining SurfaceFormat values in OpenGL
Merge branch 'develop' into develop.datacontract