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

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

More FlyView encasulation. Make QGCPipOverlay completely self contained

Make Toolstrip flickable, fix maxHeight, fix bunch of margins

Hide pre-arm message when vehicle arms

By default the Instrument Panel is the one from master,
It can be switched to alternate version by a checkbox in General Settings/Fly View

- Rename QGCInstrumentWidgetAlternate to QGCInstrumentWidget as it's now the default version
- Select  QGCInstrumentWidget as instrumentLoader source

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

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

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.

Add box around map warnings text

Allow plugins to define a left placement for its custom flight widget.
When placed on the left, the action tool strip is placed on the right side.

Have different modes for the Airspace Widget (Plan/Fly)

Adding missing qgcView to QGCMapPolygonVisuals instance in SurveyMapVisual.qml

Make all argument to AirMap queries based on what the screen shows (bounding rectangle and/or radius), respecting the limits imposed by AirMap.

AirspaceManager is now exposed by QGroundControlQmlGlobal instead of Vehicle (available all the time)

Added an "unavailable" icon for when no vehicle is connected
Toggle restriction overlays (map) on/off based on the airspace widget being expanded/collapsed respectively

Handled "airspace visible" state (not done)
Adjusted restriction map items color and opacity
Added/Updated icons for airspace traffic
Adjust colors for text over maps

All settings wired and persistent
Cleanup non Airmap builds

Eliminated flight widget "states"
Define flight widget top margin (plugin options)

Clarify the title of the "Video Stream" panel (instead of just "Video")

On large/high DPI screens, the whole UI scales nicely when increasing the
font size, except for the attitude widget, that was limited to 200 pixels.

Fixed a pile of bugs as well

Added top/bottom alignment state to map scale
Allow disabling instrument widget altogether
Added an otherwise redundant row to PlanToolbar so it matches the same button position as the main toolbar
Fixed typo (Math.max()) in ScreenTools
Fixed Javascript Exception in OfflineMap
Increased the import window size in OfflineMap
Added function to MainWindow to disable toolbar for a truly modal dialog
Added code so clicking on an open toolbar indicator will cause it to close

Plus low battery announce changes