Rewrite AveragePlane asm. Both MMX and SSE2.
Rewrite ComparePlane asm. Both MMX and SSE2.
Rewrite RGB32 -> RGB24 conversion asm. MMX and SSSE3 versions.
Rewrite RGB24 -> RGB32 conversion asm. MMX and SSSE3 versions.
Change planar Grayscale to use memset instead of looping manually
Rewrite YUY2 -> YV16 conversion asm. MMX and SSE2 versions.
Rewrite YV16 -> YUY2 conversion asm. MMX and SSE2 versions.