Tweaks to toolbar visibility

Modified support for multiple first run pages. Added first run for offline vehicle settings.

Added configurable value grid to toolbar

ToolStrip rearchitecture for encapsulation and customization

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

Fly View: Move business logic inside controls

Major rework to support terrain profile display and terrain collision reporting

Support for reusable InstrumentValueArea control

Refactor instrument value controls

Set RC To Param support

QGCPopupDialog support

VTOL Landing Pattern support

Mavlink terrain protocol support

ADSB server support provided through new ADSBVehicleManager implemenation

Support for new TakeoffMissionItem and Takeoff Tool 

Integrate Create Plan overlay in File DropPanel

New Create Plan support

Corridor edit toolbar

New control

Save/load main window state

Rework presets

Use TabBar in Complex Item UI

New QGCOptionsComboBox control

Allow split of current segment

FW Landing slope heights display

New QGCDynamicObjectManager support

New MapLineArrow control

New base class control for Survey/Corridor