Parse metadata from WAV

[echarlie]

this may be a limitation of liquidsoap, but we do not parse id3v2 (or other?) tags out of WAV files, although we happily play them. c.f. https://wavmetadata.blogspot.com/ for info on tags supported in WAV.

/tank/automation/Shows/rare-groove/2020-07-09/Cass\ McCombs\ -\ The\ Wine\ Of\ Lebanon.wav has tags 'TITLE': ['The Wine Of Lebanon'], 'GENRE': ['Alternative'], 'TRACKNUMBER': ['1/1'], 'ARTIST': ['Cass McCombs'], 'DATE': ['2020'], 'ALBUM': ['The Wine Of Lebanon'] according to pytaglib, but it was never logged.

[mutantmonkey]

Oof. This is definitely something that'd need to be supported in Liquidsoap and not something we'd want to deal with on our own. See savonet/liquidsoap#173 for the upstream issue.