Remove zoom support

Pull multiVehicleManager from QGroundControl

Turn off screen sleep if Vehicle connected

Bugs causing it to not be able to un-zoom.

Support user configurable unit conversion

Unit conversion for FactGroup and Mission Items

Reorder vehicle components

Better param reset for APM compass cal

Allow armed setup for Safety/Tuning

Fix some control width problems

Support for third compass calibration

Flash: Correct return after error

Fix ArduPilot compass cal

Fix #2987: QGroundControlQmlGlobal.h: flightMapZoom should be a doubl…

Note that a change in zoom signals a `zoomLevelChanged` event; this in turn triggers `FlightDisplayViewMap` which sets the property changed in this commit to
```
onZoomLevelChanged: QGroundControl.flightMapZoom = zoomLevel
```

This triggers the following message in Application Output: `onZoomLevelChanged: QGroundControl.flightMapZoom = zoomLevel`.

This was the case before and after this fix, I don't know if that's a real issue though

DO_JUMP fix

Add Guided mode support

PX4_CUSTOM_MAIN_MODE consistency

New QGCMobileFileDialog for mobile

Throttle-Mid Tuning