Command line options to start Remote TCP Sink

[srcejon]

The following patch adds command line options to be able to start the Remote TCP Sink on a specified device, so you can start a remote server without using the API or GUI, which should hopefully make it easier to use. E.g:

sdrangelsrv --remote-tcp --remote-tcp-hwtype RTLSDR

Additional options:

--remote-tcp-serial: Specify device by serial number, instead of a hwtype
--remote-tcp-address: TCP address of interface to listen on
--remote-tcp-port: TCP port to listen on
--list-devices: List physical devices, so you can see what needs to be passed to --remote-tcp-hwtype/serial

All the device settings (sample rate / freq etc) can be set by the client Remote TCP Device GUI, so shouldn't need command line options.

Thoughts?

[f4exb]

looks good to me