Move GStreamer setup back into the actor thread
Move GStreamer setup back into the actor thread

Make sure to terminate the whole process on GError exceptions, so that we fail
quickly on non-working output pipelines.

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