_mpv initial version
_mpv: add parameter types
_mpv: add suppressed option groups, and more work on parameter args
_mpv: fix --ao and --vo, ditch unused $state cases
_mpv: more specialized parameter handling
_mpv: add show-advanced option, enable by default on --
_mpv: add credit notice
_mpv: simple parsing for complex parameters
Merge branch '_mpv'