Cherry pick from master

More changes to ArduPilot manifest lookup

Cherry pick from master

Start Mission: Better error message

Flight mode fix, cherry picked from master

Plan: Default for terrain display is visible

Add note about ADSB server settings

Backported fixes

Better error message

Add note about ADSB server settings

Plan: Correct handling of terrain ready when loading back from file

Correct handling of terrain ready when loading back from file

More changes to ArduPilot manifest lookup

fixed preflight sensors check

Parallels build fix

Plan: Add support for takeoff item required

Plan: Add support for takeoff item required

Mobile file dialog: Handle multiple extensions correctly

Programmatic switch to SetupView leaves two buttons selected

Takeoff item wizard mode fix

Give up on getting AUTOPILOT_VERSION based on time now retry count.

Handle multiple file extensions correctly

Shape file examples for testing

Programmatic switch to SetupView leaves two buttons selected

Better error text

Give up on getting AUTOPILOT_VERSION based on time now retry count.

Wizard mode should be off for loaded items

Clear wizard mode when loading from file

Added correct handling of mavlink 2 change based on capability bits

Change default to on

Flight mode fix, cherry picked from master

Added correct handling of mavlink 2 change based on capability bits

Fix empty Plan File dropdown display

Fix empty Plan File dropdown display