BITSTREAM: Handle transform size and motion vectors more logically for non-420.
This breaks the profile 1 bitstream. Don't force non420 uv transform size to 1/4 y size. In the 4:2:0 case the chroma corresponding to a luma block is 1/4 its size. In the 4:4:4 case chroma and luma planes are the same size. Disallowing larger transforms can result in a loss of compression efficiency and is inconsistent. For sub-8x8 blocks only average corresponding motion vectors. 4:2:0 and profile 0 behavior remains unchanged. Change-Id: I560ae07183012c6734dd1860ea54ed6f62f3cae8
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