Remove unused code

- 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

Video Stream only now support photo capture from stream

Unified photo/video control which works with mavlink cameras and just video stream

Move Vibration to Analyze

Telemetry Values bar at center bottom

Ready To Fly support based on MAV_SYS_STATUS_PREARM_CHECK

Move GuidedActionsController references to global

Cherry pick stable fixes

Added configurable value grid to toolbar

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

Major rework to support terrain profile display and terrain collision reporting

Propagate opacity and interactive properties to mission items
Set opacity to 0.5 for items that are not part of the current
edit view

Support for reusable InstrumentValueArea control

Refactor instrument value controls

Fix QGCPopupDialog automatic flickable parenting

Use new QGCPopupDialog mechanism

Update value visuals to support value ranges

Initial support for value ranges

New value editing dialogs

Icon picker support

Icon support for values display

Fix blank display after page change in instrument panel

New grid based values page editor support

Stable update

Use global palette

Bring back visual sequence number in map item indicators

Fix even more bugs

Fix typo

Mavlink terrain protocol support

Skip invalid coords