Support audio HLS files

Example: http://as-hls-uk-live.bbcfmt.vo.llnwd.net/pool_7/live/bbc_radio_three/bbc_radio_three.isml/bbc_radio_three-audio%3d320000.m3u8

http://forum.serviio.org/viewtopic.php?f=7&t=18413

Input #0, hls,applehttp, from 'http://as-hls-uk-live.bbcfmt.vo.llnwd.net/pool_7/live/bbc_radio_three/bbc_radio_three.isml/bbc_radio_three-audio%3d320000.m3u8':
  Duration: N/A, start: 65757.751822, bitrate: 306 kb/s
  Program 0
    Metadata:
      variant_bitrate : 0
    Stream #0:0: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 306 kb/s

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