Updated wavpack to 5.1.0.

  added: all new command-line tagging utility (wvtag)
  added: option to import ID3v2.3 tags from Sony DSF files
  fixed: fuzz test failures from AFL reported on SourceForge
  improved: DSD decimation filter (less HF rolloff & CPU use)
  fixed: non-byte audio depths (12-bit, 20-bit) not showing
  fixed: rare case of noise-shaping triggering a lossy mute
  fixed: recognize UTF-8 BOM when reading text files
  fixed: a few portability issues

(wiz)