media-sound/clementine: several cleanups and fixes

media-sound/clementine: several cleanups and fixes

- Clean up dependencies
- Fix dependencies upon dev-libs/crypto++ (see 580134)
- Synchronise live ebuild with latest release
- Remove obsolte comments
- Reorder cmake params
- Reenable testing
- add missing USE flags:
  * added 3 missing USE flags in ebuilds of recent version: amazoncloud,
      pulseaudio and vkontakte
  * removed USE=ubuntu-one due to remove in upstream
  * slightly change description for other USEs

Signed-off-by: Lars Wendler <polynomial-c@gentoo.org>