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

This is temporary until we get rid of it

An rather unfruitful attempt at consolidating Advisories and Airspaces (they are both arrays of Airspaces). No such luck as they vary wildly. In the end, I'm now exposing the restrictions (Polygons) directly (and inherently) instead of copying them.
Tweaked polygon overlay colors and borders.

Added an "unavailable" icon for when no vehicle is connected
Toggle restriction overlays (map) on/off based on the airspace widget being expanded/collapsed respectively

Handled "airspace visible" state (not done)
Adjusted restriction map items color and opacity
Added/Updated icons for airspace traffic
Adjust colors for text over maps

Users can select multiple rules concurrently. In addition, some are mutually exclusive. Add logic to handle this.

Adjust Airspace control text color to match changing background color

Added an "unknown" weather icon for when I get "valid" data and no icon

Break apart string of classes into their own files as all in one file became unwieldy
Expose Airspace data in a QML ready format
Split global Airspace from AirMap (Only now I figured out the reason for the pure virtual root classes)
Refactored a bunch of things to make it consistent and/or obvious

All settings wired and persistent
Cleanup non Airmap builds

Move all airmap related stuff to its own directory

* commit 'ebb5b8ce': (40 commits)
  Including airmapd into the repo (macOS only)
  Restore expanded state when enabling AirMap
  AirMap Settings
  Control on Fly View Eliminated flight widget "states" Define flight widget top margin (plugin options)
  Add expand icon
  Expand/Colapse Controllers Adjust colors Remove unused image
  Initial Mockup
  qgroundcontrol.pro: update build to latest airmapd master
  AirMapManager: update authorizations to changed airmapd interface
  rebase fixup: remove AirMapController.{cc,h}
  remove submodule commits qmqtt and tiny-AES128-C
  AirMapManager: error handling, change to updated API of airmapd
  AirMapManager: update polygons to changed airmapd interface
  AirMapManager: update flight search according to updated airmapd
  AirMap: remove SITA registration numbers
  AirspaceManagement & AirMapManager: add weather request API
  AirMapManager: add LifetimeChecker class to prevent callbacks from accessing invalid memory
  AirMapManager: handle multi_polygon
  AirMapManager: change backend to use airmapd
  AirMap: refactor for multi-vehicle support & base class API
  ...

Write only metadata

Move  MAV_PARAM_TYPE to  MAV_PARAM_EXT_TYPE as we're now using the proper MAVLink version.