Imported Upstream version 0.8.0
Merge tag 'upstream/0.8.0'

Upstream version 0.8.0
- Imported Upstream version 0.8.0
- Min liblxqt-qt5-0-dev version 0.8.0
- Min Qt version 5.3.2
- bump standards to 3.9.6
- desktop-file fix OnylShowIn=LXQt;
- add lintian-overrides for missed manpages and invalid category