Add .dsf files to audio libraries

[Veselin Markov]

Some A/V receivers can play DSD audio. DSD audio is being stored in .dsf or .dff files. It would be nice if Serviio lists the files for playback. Some work done is attached to this ticket.

[Illico]

Another request here : http://forum.serviio.org/viewtopic.php?f=11&t=19156

[Petr Nejedly]

A new version of jaudiotagger now supports this. https://bitbucket.org/ijabz/jaudiotagger/downloads

http://forum.serviio.org/viewtopic.php?f=22&t=18707&p=101596#p101596

[Agrushin]

In 1.6 and 1.7 added just .DSF and what about .DFF? it's another one file format for DSD and it also can be played by many AVR. Are you going to add it to Serviio playback list?