* Add LG soundbar support
We can autodiscover these, so for now let's skip any local configuration.
Currently we expose volume, source and equaliser preset - we can expose the
other volume controls and options as well if necessary, but I don't know
whether it's worth it.
* Add discovery of LG devices
This is a generic discovery type that doesn't obviously contain enough
information to identify whether we're talking to a speaker system or any
other kind of device - on the other hand I haven't been able to find any
other LG devices that respond like this, so we can cross that bridge when
we get to it.
* Lint
Matthew Garrett