* Playlist now queues addEntries/insertEntries calls if it's not loaded yet.
* Only try to update playlist if it's loaded.
* RecentPlaylistsModel needs to manually load playlists now.
* Added setLoaded( bool ) to Playlist, for derived classes to make use of.
* Call setLoaded() from DynamicPlaylist.
* PlaylistItems don't need to worry about playlists being loaded anymore.
* Don't load playlists on startup.
* Load playlists before showing them.
* Style cleanups.