Displaying Composer at control points/renderers

[simoncn]

This setting prevents AlbumArtist values from being sent to the control point while allowing Composer values to be sent. To do the same thing in MinimServer 2, set upnpCustom to roleTags={Composer}.

The default if nothing is set in upnpCustom is to send AlbumArtist and Composer values to the control point so that the control point can decide how best to use this information. This is the right thing to do with most control points.