* Update PlaylistDelegate.
* Track::socialActionPixmaps( action, height ) returns a list of matching avatars for a particular social action.
* Forgot to update Track header for last commit.
* PlayableProxyModel::ShortWithAvatars is obsolete.
* Added PlaylistItemDelegate::drawLoveBox() which paints a little box showing all the sources that loved a particular track.
* Use love-box in PlaylistLargeItemDelegate.
* ShortWithAvatars is obsolete.
* Style fixes.