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

PX4 flight mode config update

- Convert mission load/save to it
- Allow parameter load/save on mobile

Save params with 18 digit precision

Fix settable flight mode channel

iOS fixes

Flight Mode string cleanup

Correct version info for all OSX/iOS builds

Simple FM config: Show Advanced if older firmware

Laundry list: Fixing things while tablet testing

Fix flight mode channel

Change 3DR Radio -> SiK Radio

Much better missing SD Card detection