matroska: Add new pixels format support
- Add support for GRAY10_BE32, RGBA64_LE, BGRA64_LE, GRAY16_LE
Can be used with:
gst-launch-1.0 videotestsrc ! 'video/x-raw,format=GRAY10BE_32' ! matroskamux ! matroskademux ! videoconvert ! glimagesink
gst-launch-1.0 videotestsrc ! 'video/x-raw,format=RGBA64_LE' ! matroskamux ! matroskademux ! videoconvert ! glimagesink
gst-launch-1.0 videotestsrc ! 'video/x-raw,format=BGRA64_LE' ! matroskamux ! matroskademux ! videoconvert ! glimagesink
gst-launch-1.0 videotestsrc ! 'video/x-raw,format=GRAY16_LE' ! matroskamux ! matroskademux ! videoconvert ! glimagesink