Rewrite DespotifyBackend to use new backend API
Rewrite DespotifyBackend to use new backend API

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