* Allow GPIO0; check for conflict with user button
* Guard for no BUTTON_PIN; handle portduino
* Portduino settings: attempt two
We don't really need to #include radio code here just to check if the pin is RADIOLIB_NC. We're only interested if scanAndSelect pin matches user button pin, but they won't match if user button is RADIOLIB_NC.
* Portduino attempt 3: glue