Fixes https://github.com/mavlink/qgroundcontrol/issues/6770

Fixes https://github.com/mavlink/qgroundcontrol/issues/6770

The build system will look for src/Airmap/Airmap_api_key.h
If it find is, it will used the provided API key and client ID for Airmap.
That file should provide two strings:
static const char* kAirmapAPIKey = "key data";
static const char* kAirmapClientID = "id data";

Local builds, without these will have no Airmap support by default (users can always enter their own within the Airmap settings panel).

For much better performance

Added (UI) support for vehicles exposing more than one camera.

Fix sorting issues with QmlObjectListModel
Show airspaces in Plan View as well

Remove/comment off debug output pollution

Rewrote editor to be performant enough to support typedown

The overloaded member signal just hit us, to use it is a pain
but the resuting code is faster and less error prone, so it's
still a good thing to do.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

- Pervasive change to automatically connect to known board types
- Lots of additional changes along with this:
- More exposure of objects/properties to Qml
- Much restructuring in LinkManager and LinkManager clients

- Pervasive change to automatically connect to known board types
- Lots of additional changes along with this:
- More exposure of objects/properties to Qml
- Much restructuring in LinkManager and LinkManager clients

- Pervasive change to automatically connect to known board types
- Lots of additional changes along with this:
- More exposure of objects/properties to Qml
- Much restructuring in LinkManager and LinkManager clients

- select active vehicle
- arm/disarm
- select flight mode

Also:
- Remove unused code

Also much other cleanup/change

Plus more overall ui work

- New MissionManager
- Plumb MissionManager through MissionEditor
- Mission Editor supports get/set