Instantiate a PX4 config view in PX4 mode from start, since boards with just the bootloader (or no working telemetry) cannot be flashed else.

Migration to single parameter widget; ignore RC updates on unmapped channels 

don't process updates to unmapped rc channels when we're not in
calibration mode

send RC params to the known correct component ID

workaround problem where QVariant param values arrive as QString

Indicate AUTO submodes.

Config resolve

Minor improvements in airframe config, param transfer / reboot are still not quite doing what we want

trying to make autoconfig more robust

- minor refactor of airframeconfig.cc
- add placeholder for new scratch build multirotor

Speak and show critical messages in message view

RC calibration and mapping debug

Add "skip" buttons in msg box (instead of cancel); allow user to cancel
upload of rc params after reviewing them

Add persistRcValuesButt to allow mappings to be persisted outside the
calibration mode; cleanup const params in param dataq model;  add some
debug for mapping problems

Cleanup pending items tree completely when we receive an update