[Feature] AirPlay: Music tags and progress fixed on target device in beta 6

On beta 2 through beta 5, when casting music to an Apple TV 3 with AirPlay, the Apple TV showed “Untitled - Internet Radio” in “Now Playing” and the progress bar (time elapsed) was not shown. This is fixed in beta 6 and now works as expected. (I think this also means iTunes in the Cloud is fixed, but I can’t confirm that yet.)