[shoutcast] Handle GRL_METADATA_KEY_URL
[shoutcast] Handle GRL_METADATA_KEY_URL

Add url link to listen stations.

MathieuDuponchelle/grilo-plugins,kyoushuu/grilo-plugins,kyoushuu/grilo-plugins,MathieuDuponchelle/grilo-plugins,vrutkovs/grilo-plugins,jasuarez/grilo-plugins,MikePetullo/grilo-plugins,MikePetullo/grilo-plugins,MathieuDuponchelle/grilo-plugins,GNOME/grilo-plugins,grilofw/grilo-plugins,GNOME/grilo-plugins,vrutkovs/grilo-plugins,grilofw/grilo-plugins,MathieuDuponchelle/grilo-plugins,MikePetullo/grilo-plugins,vrutkovs/grilo-plugins,jasuarez/grilo-plugins,kyoushuu/grilo-plugins,vrutkovs/grilo-plugins