release-0.4.0

Krille-chan

@KrilleFear

2fb8ecfd · Merge branch 'app-enhance-release-0-4-0' into 'master' · Dec 10, 2019

### New features
- Mute notifications per room now possible
- New design for the navigation pages
- More integration tests
### Fixed
- Changing permissions destroys the power levels of a room
- Fix a lot of little bugs