Pascal Massimino bfd3fc02df ~2x faster SSE2 RGB24toY, BGR24toY, ARGBToY|UV
global effect is ~2% faster encoding from JPG source
and ~8% faster lossless-webp source decoding to PGM (e.g.)

Also revamped the YUVA case to first accumulate R/G/B value into 16b
temporary buffer, and then doing the UV conversion.
-> New function: WebPConvertRGBA32ToUV

Change-Id: I1d7d0c4003aa02966ad33490ce0fcdc7925cf9f5
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