Add markup to the first notification line to overcome problems with KNotify.
Automatic merge of Transifex translations
Merge pull request #179 from xhochy/fix/knotify-recognize-richtext

Add markup to the first notification line to overcome problems with KNotify.
* Fixed avatar creation in wrong thread and start-up slow down.
* Removed obsolete QPixmap.
* Added typedefs for Artist & Album weakpointers.
* Only store weak-pointers in the internal Album cache.
* Only store weak-pointers in the internal Artist cache.
* Delete root-item when destroying the PlayableModel.
* Style fixes.