More work on encapsulation in Fly View

App messages now use simple modal message dialogs. Vehicle messages continue to use non-modal popup.

New QGCPopupDialog mechanism

QGCPopupDialog support

added function to FlightView to show the checklist if switching views from a view other than FlightView and if checklist should be shown

Android OpenSSL support

Prevent view switching apis support a stack

View switch prevention support

Check for pending param writes on app close

Save/load main window state

Move Log Replay bar to Window footer

Move fly view away from background and into main window. The size different was causing the map not to match the one in plan view.

Enable full screen / windowed toggle

Enlarge touch are to dismiss system messages

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)