Sound: Port to a copy-on-write concept

This change makes it so sound handles are created for evaluated scene,
sequencer and speakers. This allows to have properly evaluated animation
on them.

For the viewport playback sound uses regular dependency graph.

For the final render sound uses dependency graph created for render pipeline,
which now also contains sequencer and sound datablocks.

All the direct sound update calls are replaced with corresponding dependency
graph recalc tag.

source/blender/editors/transform/transform_generics.c

@@ -1183,6 +1183,8 @@ static void recalcData_sequencer(TransInfo *t)
     seq_prev = seq;
   }
 
+  DEG_id_tag_update(&t->scene->id, ID_RECALC_SEQUENCER_STRIPS);
+
   flushTransSeq(t);
 }