- Now responds to request_list using a worker routine to send out
params one at a time
- Support for failure modes for unit testing

Instantiating QSettings on the stack is quite expensive (full file read+parse each time) and this was done in a tight loop with mission items as they were dragged. Very slow.

- Delay gps position for better testing
- Longer delay on home position

Height will shrink to fit small text heights

This allows you to arm

Also don’t pop errors for initial request failure on generic vehicle.

- Max tile download count now handled here
- Fixed signaling problems