when a quadplane touches down in an auto throttle mode the pilot may
use rudder to disarm. The check for rudder disarm was only active in
modes without auto-throttle. This expands it to all modes if the
throttle has hit the lower limit
Send a "Geofence breach" message to the Ground Control Station. Without this when the fence is breached and if anything happens as a result, such as RTL, it will happen silently.
ArduPlane: Remove some geofence logic from ArduPlane
ArduPlane: Refactor action and mode return implementation
ArduPlane: Use polyfence to find the return point.