Include support for reading of WavPack MD5 signature of raw audio data

[audiomuze]

Like FLAC, WavPack can also compute & store the MD5 signature of raw audio data when encoded using -m

It can be displayed using wvunpack -f7 filename.wv

Please add support to retrieve the md5 from WavPack files when present.

I'd be happy to provide a link to a downloadable file if required.

[audiomuze]

Bumping this, being able to ingest the MD5 signature of raw audio data makes it easy to detect duplicate files and albums in a collection. Please incorporate support for reading the MD5 when present.