Adding AGC setting to Remote Control

[markjfine]

I've recently added some simple remote control to an application I developed called Frequency Browser that includes Frequency read/write, Mode/Bandwidth read/write, and timer-triggered Meter reads.

A 'nice to have' would also be commands to read/write the AGC setting, which would also complete controlling gqrx's receiver options. I don't see anything for it, unless I've missed something. I can assist with the code modification, if needed.

Cheers in advance.