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video-converter: Add fast paths from v210 to I420/YV12, Y42B, UYVY and YUY2

Sebastian Dröge requested to merge slomo/gst-plugins-base:from_v210_fast_paths into master

These then don't require going through the generic code path via AYUV64 first but can be converted directly.

This speeds up processing of videotestsrc ! v210 ! videoconvert ! other_format ! fakesink by a factor of 1.55 for I420/YV12 and 1.40 for the other destination formats and reduces memory pressure considerably.

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