Allow audio/mpeg streams next to m3u8 playlists

[raboof]

For example the streams of the Dutch public radio, such as http://icecast.omroep.nl/radio2-bb-mp3, directly produce an audio/mpeg stream instead of wrapping them in an m3u8 playlist first. It would be cool if that was supported as well.

[raboof]

I did some digging: Alarmio uses the HLS media source. When I switched to https and used the ProgressiveMediaSource instead (https://pastebin.com/VBYavgPu) I could indeed hear the stream above.

It would be nice to support both - should we just catch the UnrecognizedInputFormatException from the HLS source and then try the Progressive one instead? Not very sophisticated, but might be OK?

[raboof]

should we just catch the UnrecognizedInputFormatException

Ah, but that'd have to be in onPlayerError... that's perhaps a bit obscure? Should we introduce a new 'type', and have the user choose between HLS and 'other' streams?

[raboof]

Fixed by #87