Renamed audio_codec_list to audio_codecs

darcs-hash:20090817221813-58252-563d28f258993cf9b5ec84d8855f1a8914bfd967
Renamed audio_codec_list to audio_codecs in global settings

darcs-hash:20090817222052-58252-33c431e5da2583439168d8806589a0f6f8ff9494