[Diet] Moved SharpDX math stuff to separate assembly.
[Diet] Re-added SharpDx.Multimedia files that shouldn't have been removed.
[Diet] Added SharpDX.Math project file.
[Diet] Fixed some minor issues in SharpDX.Math
[Diet] Removed dependencies of Vector4/Vector3 from ColorBGRA.
[Diet] Finished moving things to SharpDX.Math.