Add check sync sound channels for completion in openal and stop them ASAP. For #406 and #410
Add check sync sound channels for completion in openal and stop them ASAP. For #406 and #410

madrazo/nme,haxenme/nme,madrazo/nme,thomasuster/NME,madrazo/nme,haxenme/nme,thomasuster/NME,madrazo/nme,haxenme/nme,haxenme/nme,thomasuster/NME,thomasuster/NME,madrazo/nme,haxenme/nme,madrazo/nme,thomasuster/NME,thomasuster/NME