media-sound/flacon: version bump to 1.2.0 wrt bug #547054, update live

media-sound/flacon: version bump to 1.2.0 wrt bug #547054, update live

Inherited from Nikoli.
List of changes in 1.2.0 compared to 1.0.0 by Nikoli:
- add Qt5 support
- add Opus output files support
- properly separate DEPEND and RDEPEND
- rename mp4 USE to aac for clarity, since mp4 is just a container while
  aac is an actual encoding format that is used
- rename ogg USE to vorbis for clarity, since ogg is just a container
  while vorbis is an actual encoding format that is used
- update USE descriptions to clarify which ones are used for input and
  which ones are used for output
- remove ugly 9999 conditionals from ebuild as they make it hard to read
- remove defunct, rudimentary translations
- sync DESCRIPTION with upstream

Sync live ebuild with 1.2.0

Gentoo-Bug: 547054