Unit test for mission transfer error string checking

Much better error reporting for Mission transfer errors

The receiver should not touch the old videos folder, it's not
the responsible class for that.

The VideoReceiver should work 'as is', without depending on the
whole application or in the settings. This patch removes all the
hard dependencies on QGroundControl, FactSystem and Settings system
so it's easier to isolate and test the code.

Fix incorrect passing of firmware type

Fix ArduPilot fake home position handling

Mavlink terrain protocol support

Added compiler switch for developers to generate survey preset default json files for use as built-in survey presets in custom builds

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

Are you sure check on preset delete

Support for built-in preset delete prevention

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

Fix altitude mode setting for correct control display

Fix load order so isManualCamera returns correct value

Show errors from preset load failures

Allow telemetry settings section to hide