Cherry pick from master

Better error message

Add note about ADSB server settings

Correct handling of terrain ready when loading back from file

More changes to ArduPilot manifest lookup

Plan: Add support for takeoff item required

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

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 even more bugs

Fix alternate transect support

Fix typo

Fix ArduPilot fake home position handling

Revert "Handle gstreamer signals on main QGC thread to avoid deadlock; Remove video sink from pipeline if pipeline failed to start"

This reverts commit a9401de7.

Vehicle command send logging

Fix broken ADSB vehicle code

Even better manifest logging

Better logging for ArduPIlot manifest lookup

Fix auto-display of Plan/File

Skip invalid coords

Remove some more Follow stuff

Remove ArduPilot Follow Me support from Stable

Put back ToolStrip titles which were mysteriously removed