Clean up references to MainRootWindow globals

- add NOTIFY for distanceSensor property
- add DistanceSensorReadingsChange() callback prototype

- revert excessive NOTIFY
- adding MaxSensor into DistanceSensor frame handling

- add proximity radar view in map view
- add proximity radar view in video view

change distance label positioning in video view

clean up unwanted comments

- space up proximity sectors
- revert unwanted changes in qgroundcontrol.qrc

squashed commits

Move GuidedActionsController references to global

Fix ROI, Orbit, Goto handling

Re-architect toolbar for better customization capabilities. Also use less real estate.

Rework Fly View into separate layers which can be customized at each layer.

More FlyView encasulation. Make QGCPipOverlay completely self contained

More work on encapsulation in Fly View

Support Keep map centered on vehicle

Make Toolstrip flickable, fix maxHeight, fix bunch of margins

ADSB server support provided through new ADSBVehicleManager implemenation

Fix scoping of visibility changes

Better flight trajectory point algorithm

Plugin'ized follow me support

Directions arrows in Fly View

Hide waypoint indicators unless they are really needed

Add Terrain toggle to MapScale control

Zoom buttons move to MapScale control

Configurable maximum distance on Go To Location

Update all files that use a QML Menu item to QtQuick.Controls 2.4 to solve the issue of a menu showing up in random places on Android.

New qml base log replay status bar

Clip PIP window so when video is set to fit width, the hight is clipped
Remove ExclusiveGroup from CameraCalc radio buttons
Remove ExclusiveGroup from FWLandingPatternEditor radio buttons
Set main window minimum width and height

Make ToolStrip font smaller (Desktop builds)
Check for auto configured video stream before testing video source type

Handle connection to non initialized target

Use a root based global variable (mainWindow.flightDisplayMap) instead of relying on child scoped names (_flightMap)

Fixed flight widget position.

Get rid of QGCView, QGCViewPanel and FactPanel. All messages and dialogs are now handled in the root window.

Fix jscript complaint

Hide guided map indicators when vehicle goes away

Better show/hide behavior of guided map indicators

Show Orbit center from telemetry