LMP: added TrackGenres.
LMP: styling fixes.
LMP: LocalCollection::GetAlbumArtManager().
LMP: set artist name for album items in LocalCollection.
LMP: preview mode for album art manager.
LMP: added AlbumArtManagerDialog.
LMP: expose AlbumArtManagerDialog.
LMP: clear line edit addons.
LMP: don't request AA if request is empty.
LMP: fix compilation error.
LMP: handle multiple images/requests in AA manager.

Choose the best (currently the widest) image.
LMP: support loading cover art from files.
Azoth: Qt 4.7 compat.