Move all airmap related stuff to its own directory

which is now a shared library

You need to adjust the 'AIRMAPD_PATH = path_to_airmapd' in
qgroundcontrol.pro to make it compile.

And sorry for the huge commit :/

- add multi-vehicle support: each vehicle has now a per-vehicle AirMap
  object that takes care of flight creation, traffic & telemetry
- add a base class API layer so that the interface between QGC and the
  AirMap implementation is clear, and easier to change
- removes polygon upload to vehicle (needs a better solution)

Added AirMap settings (SettingsGroup)
Added AirMap settings block to General Settings
Create macros to deal with the tedious repetitions within SettingsGroup
Removed old, hacked in setting for AirMapKey
Remove a few of the tons of build warnings

Requires protobuf to be installed on the build system

Source: https://github.com/kokke/tiny-AES128-C
License: public domain

Converted Structure Scan to use CameraCalc such that it now works with
camera specs.

Also hand carried text to speech changes from Stable to master. Plus
unit tests for that.

Need to hand carry some stuff from Stable to master in order to fix

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Also rename QmlPageInfo to QmlComponentInfo to cover more use cases

Also plugin'ize intrument panel PageView pages

This needs Qt 5.9. Do not merge it yet.

Hide "Save Path" as it breaks the UI in General Settings.

Correctly supports application name and branding changes

https://bugreports.qt.io/browse/QTBUG-61424