Diff of FFmpeg/VP6

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[[FFmpeg]] | [[VP6]] > [[FFmpeg/VP6]]

- macros unit test for VP6
--  https://gist.github.com/yoya/8a1eb5e2603c4d0307063aa8ce8d0509

- hpeldsp unit test for VP6
--  https://gist.github.com/yoya/d35bd9c5c66695c89bf2ba8452734998

-  h264chroma unit test for VP6
--  https://gist.github.com/yoya/4323b860c5159388e315adba7d1f2b9e

- videodsp unit test for VP6
--  https://gist.github.com/yoya/775ec5d7743bc031f81277e4ac0633b2

- vp3dsp loop filter unit test for VP6
--  https://gist.github.com/yoya/8af1bfca674059ea002dbf9cd0a0eae7

- vp56_deblock_filter for VP6
--  https://gist.github.com/yoya/5745ea3411960f4dbdfd446538d5a55b