Expose root plan keys

Replacing colors with the ones provided by Airmap.
Adding border color and width.
Adding airspace ID so it can later be linked to the advisory list.

Also cleaning up annoying c++14 warnings.

Fix swapped climb/descent

Fix incorrect qCWarning

Renamed "Invalid" (airspace) to "custom"

Hack fix for terrain crash when new query comes through before old query is complete

Don't show compass orientations for fixed orientation vehicles.

Fix Change Command parameter default setting

The "Now" button now sets a "now" flag instead of adjusting the start time. Once the flight is created, the actual "now" time is set for flight start time.
The button is also exclusive. Once set, the start time slider is hidden as it becomes irrelevant.

Fix trad heli mappings

If briefing evaluation returns no authorization, assume none is required. This is reflected in the UI as "Authorization Not Required".

Formatting changes

Fix NuttX build url format

ArduPilot ChibiOS support

Added some basic color management for airspaces

Hide flight speed and camera section for ArduPilot. This is because it doesn't allow mission items to be before the TAKEOFF command.

Don't add takeoff as first item when it doesn't make sense for vehicle

Change Command only supported for Simple Items

Prompt for Reboot after compass cal

Respect app units

Use NaN to signal lower level error