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.

Preparation for auto-connect having no connect/disconnect buttons.

Tweak toolbar height for mobile.

It was using wrong size variable (and consequently too big)