Update LastfmFrontend to use new BackendListener
Update LastfmFrontend to use new BackendListener

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