Prefer using FFmpeg musepack decoder/demuxer
- Bump the rank of the musepack v7/v8 FFmpeg demuxers to SECONDARY
- Bump the rank of the musepack v7/v8 FFmpeg audio decoders to SECONDARY
- Demote the rank of the musepackdec element to MARGINAL
This is for two reasons:
- The musepack library is no longer maintained, whereas the FFmpeg implementation can/will receive fixes
- The
musepackdec
implementation was a all-in-one "parsing and decoding" blob which doesn't play nicely with decodebin3 and others
Fixes #3033 (closed)