Custom device configuration definitions and GUIs

[cjcliffe]

It would be nice to create more refined configuration GUIs for specific devices in a way that can be controlled outside of CubicSDR main source. I think providing a standard mechanism for augmenting the SoapySDR module settings with additional graphics, parameter controls/dependencies and help would be a good start.

• [ ] Create XML definition spec for custom configuration GUIs
• [ ] Allow extended definitions and controls for configurations
• [ ] Support standard and advanced view
• [ ] Support dependencies for showing/hiding and preventing invalid configuration settings
• [ ] Allow placement/size/type of GUI element for configuring paramters
• [ ] Support custom background graphics and graphic elements
• [ ] Support custom help information (another graphic?)
• [ ] Provide standard way to install definitions (~/.CubicSDR/..?)
• [ ] Provide some basic 'classes' or options for desired visual GUI effects/fonts/colors
• [ ] Re-create SDRPlay and RTL-SDR ExtIO style interfaces to test

[romeojulietthotel]

A per-device control panel makes a lot of sense and would be very useful and user-friendly.

Antenna selection would fall into this too I think.

https://github.com/cjcliffe/CubicSDR/issues/559