- Switch to GH account used by Debian
- Update patch-cplay to remove upstreamed changes and add mpv support
- Add off-by-default dependency options for supported audio players
- Change to USES=python:-2.7; runtime testing with python3 failed
- shebangfix added to remove need for ${LOCALBASE}/bin/python symlink
- Add patch-po_fr.po to fix build error fr.po:78: 'msgid' and 'msgstr'
  entries do not both end with '\n'

Reviewed by:	adamw
Approved by:	koobs, mat (mentors)
Relnotes:	https://github.com/hukka/cplay/blob/v1.50/ChangeLog
Differential Revision:	https://reviews.freebsd.org/D7200