Mostly trying to get logging to happen through rclone's log methods.
Added request logging, and a trace parameter that will dump the
entire request/response for debugging when dealing with poorly
written clients.
Also added a flag to specify the device's "Friendly Name" explicitly,
and made an attempt at allowing mime types in addition to video.
Again, mostly just copying what I see in other implementations. This
does seem to have done the trick so that I can now pause, fast forward,
rewind, etc., on my Samsung F series.
