Add degrees/radians conversion

Android builds add 32/64 bit text to version string

Restored FirmwareUpgrade.qml as it was beyond repair. Also fixed some issues that were present in the original, master version.
Added "hasAPMSupport" to QGroundControl global control. This is to determine if APM support is enabled or not.

Add support for ArduRover MockLink

ArduPilot for configurable mavlink stream rates

Support for new AltitudeFactTextField

On desktop (Ethernet connection), the ground unit pushes UDP directly, which makes the use of an actual "Link" not possible. Instead, I've moved all of Taisync support to a "manager" owned by QGCToolbox.
Added a Taisync settings with some basics already wired and running.

Add support for specifying fixed RTK base position

AirspaceManager is now exposed by QGroundControlQmlGlobal instead of Vehicle (available all the time)

Move all airmap related stuff to its own directory

Replacement code to speed up work on the map and fighting mistake 'manual control lost' when connected joystick with armed UAV

This allows for better multi-vehicle testing

* Map type now set from General settings
* No map type control in maps

Instead of hardcoded "QGroundContorl" strings

Convert bool settings to SettingsFact

* Holds all the settings for the app
* Allows core plugin to override default values

Made QGCCorePlugin derive from QGCToolBox and expose everything through the same mechanism as everything else.