mpd: Support albums in browse
mpd: Support albums in browse

Albums are also containers of tracks, similar to directories and
playlists. Treat them equally when browsing.

bencevans/mopidy,jodal/mopidy,diandiankan/mopidy,jcass77/mopidy,dbrgn/mopidy,glogiotatidis/mopidy,mopidy/mopidy,mokieyue/mopidy,jmarsik/mopidy,tkem/mopidy,ZenithDK/mopidy,vrs01/mopidy,mokieyue/mopidy,kingosticks/mopidy,adamcik/mopidy,ali/mopidy,swak/mopidy,hkariti/mopidy,ali/mopidy,mokieyue/mopidy,ali/mopidy,quartz55/mopidy,liamw9534/mopidy,jmarsik/mopidy,ZenithDK/mopidy,bencevans/mopidy,rawdlite/mopidy,vrs01/mopidy,pacificIT/mopidy,kingosticks/mopidy,SuperStarPL/mopidy,quartz55/mopidy,ZenithDK/mopidy,SuperStarPL/mopidy,bencevans/mopidy,jmarsik/mopidy,rawdlite/mopidy,pacificIT/mopidy,swak/mopidy,pacificIT/mopidy,dbrgn/mopidy,tkem/mopidy,ali/mopidy,bacontext/mopidy,jodal/mopidy,hkariti/mopidy,glogiotatidis/mopidy,bacontext/mopidy,tkem/mopidy,liamw9534/mopidy,rawdlite/mopidy,priestd09/mopidy,adamcik/mopidy,jmarsik/mopidy,woutervanwijk/mopidy,jcass77/mopidy,rawdlite/mopidy,jcass77/mopidy,swak/mopidy,SuperStarPL/mopidy,quartz55/mopidy,mokieyue/mopidy,quartz55/mopidy,pacificIT/mopidy,kingosticks/mopidy,woutervanwijk/mopidy,vrs01/mopidy,priestd09/mopidy,bacontext/mopidy,bacontext/mopidy,adamcik/mopidy,swak/mopidy,priestd09/mopidy,hkariti/mopidy,mopidy/mopidy,mopidy/mopidy,hkariti/mopidy,jodal/mopidy,dbrgn/mopidy,glogiotatidis/mopidy,SuperStarPL/mopidy,bencevans/mopidy,tkem/mopidy,vrs01/mopidy,diandiankan/mopidy,dbrgn/mopidy,diandiankan/mopidy,diandiankan/mopidy,ZenithDK/mopidy,glogiotatidis/mopidy