New VehicleLinkManager implementation

function "QLineF::IntersectionType QLineF::intersects(const QLineF &line, QPointF *intersectionPoint) const" was introduced in Qt 5.14, and QLineF::intersect is obsolete.

see also:
https://doc.qt.io/qt-5.14/qlinef-obsolete.html
https://doc.qt.io/qt-5.14/qlinef.html#intersects

Refactor/fixes for ProximityRadar and friends

QGCFileDialog remove separate mobile fileExtension properties

Clean up references to MainRootWindow globals

Fix bugs related to dynamic fact groups

Full BATTERY_STATUS support

PX4 multi-battery setup

Remove unused code

Remove logging

- 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

Less twitchy value grid width sizing

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

Remove unused code

Telemetry Values bar at center bottom

More flight mode, vtol mode, armed into main status

Ready To Fly support based on MAV_SYS_STATUS_PREARM_CHECK

Shorten meta data keys for smaller file sizes

Replace qFuzzyCompare with better functioning QGC::fuzzyCompare

Support stacked component dialogs

Horizontal scrolling as needed

Support for Vehicle and Firmware classes

Base channel max solely on channel count

Fix crash

New Transect common controls

Fix QGCTabBar icon support

Initial support for global plan-wide altitude mode setting

Fix location of Qt.inputMethod.hide()

Rework handling of fw/vehicle type with respect to conflicts with actual vehicle types.

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Mobile Log Replay: Fix file dialog

Tweaks to toolbar visibility

Add Close button

Cherry pick virtual joystick fix from Stable