Solidify param handling

Fix retransmit

Also move default component ID into data model

Fixed race issues in config upload, tested to be reliable now - board startup scripts now need the other half of testing

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