Unit Test for Survey command sequence generation

Major rewrite of Survey generation for simplicity. Also includes support for CONDITION_GATE.

Temporary use setting for using CONDITION_GATE in Patterns

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

Don't show (Rel) all the time

Fix load order so isManualCamera returns correct value

Show errors from preset load failures

Allow telemetry settings section to hide

Fix Done Tracing <-> Done PolyFoo in wizard relationship