Added remote control commands for IQ recording

[mhassell]

I expanded the remote control / telnet commands to include AOIQ and LOIQ to emulate the AOS and LOS commands to capture the IQ data instead of audio. I connected the remote control commands to the IQ tool by making a public pointer in remote control point to the IQ tool.

I tested my changes by opening two shells and launching gqrx from the first shell and enabled TCP communications. On the second shell, I then ran telnet and sent the AOIQ and LOIQ commands to GQRX, confirming RPRT 0 responses:

telnet 127.0.0.1 7356

Trying 127.0.0.1...

Connected to 127.0.0.1.

Escape character is '^]'.

AOIQ

RPRT 0

LOIQ

RPRT 0

I then checked that a .raw file was created where specified in the gqrx configuration, and that was indeed a collection of IQ data I was able to play back in GQRX to show functionality.

[mhassell]

I should add this partially implements this requested feature