AudioPlayerLibrary: Playlist Support

Streaming suddenly came much more useful as I implemented m3u, xspf and pls support in the audio player library. The library treats them as alternative sources to fetch the requested stream from, not as a list of sources it needs to play. I had disabled the Internet Radio in gogglesmm, but now that http/icecast streaming actually works (aka rather usuable) I've re-enabled support for it.