changed path of libavcodec/lavc_common
+ return vc_copylineRGB[A] for RGB->RGB and RGBA->RGBA instead of vc_memcpy - we cannot know if caller wants or doesn't want to use rgb-shifts other than default. Both implementations call vc_memcpy if s/he does
Improved UG decoder selection in get_decoder_from_uv_to_uv - now is selected nearest better codec. + written a test for the above