- Pervasive change to automatically connect to known board types
- Lots of additional changes along with this:
- More exposure of objects/properties to Qml
- Much restructuring in LinkManager and LinkManager clients

Joystick: Fix calibration and default use: Do not send anything to vehicle until enabled. Enable after calibration by default.

This way you don’t have to implement things twice

Changed to “f” string conversion from “g” to get better results

This wasn’t quite coded correctly. Mavlink needs heartbeat first, then
the shell command will be issued.