Imported Upstream version 0.8.0
Merge tag 'upstream/0.8.0'

Upstream version 0.8.0
- Imported Upstream version 0.8.0
- Min Qt version 5.3.2
- Minliblxqt-qt5-0-dev version 0.8.0
- bump standards to 3.9.6
- patch desktop file with registered categories
- override warning about missed man-page, as lxqt-about will never have
  a manpage