Cover background idea

Feel free to use or discard - again ;-)
Merge branch 'sailfishos' of https://github.com/Morpog/fahrplan into Morpog-sailfishos
Some compile fixes for sailfishos
Merge branch 'Morpog-sailfishos' into sailfishos
Disabled calendar support in sailfish for now.
Changed settings loading
Removed spec file from git
Making sure the fahrplanBackend is available in the cover too, for later use.