libutvideo: Add Ut Video encoder wrapper

All colorspaces are supported.

Renamed libutvideo.cpp to libutvideodec.cpp.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/utils.c

@@ -852,6 +852,7 @@ static int is_intra_only(AVCodecContext *enc){
         case CODEC_ID_VCR1:
         case CODEC_ID_DNXHD:
         case CODEC_ID_JPEG2000:
+        case CODEC_ID_UTVIDEO:
             return 1;
         default: break;
         }