grl-dleyna: Include TypeEx property for media object while filtering properties
grl-dleyna: Include TypeEx property for media object while filtering properties

The MediaServer2Spec Type property can be set to one of only seven possible values: 'container','video',
'video.movie', 'audio', 'music', 'image' or 'image.photo'. This doesn't allow us to differentiate
between different container objects.
TypeEx is the MediaServer2Spec extended type property. TypeEx is a superset of Type.
It can be used to distinguish between an artist container and an album container. An album container
has type container but extended type object.album.musicAlbum .

GNOME/grilo-plugins,GNOME/grilo-plugins