Ready To Fly support based on MAV_SYS_STATUS_PREARM_CHECK

New Transect common controls

Tweaks to toolbar visibility

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

Added configurable value grid to toolbar

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.

Major rework to support terrain profile display and terrain collision reporting

Support for reusable InstrumentValueArea control

Set RC To Param support

QGCPopupDialog support

Integrate Create Plan overlay in File DropPanel

New Create Plan support

Corridor edit toolbar

New reusable file dialog for KML/SHP loading

Save/load main window state

Rework presets

Use TabBar in Complex Item UI

New QGCOptionsComboBox control

FW Landing slope heights display

New QGCDynamicObjectManager support

New base class control for Survey/Corridor

Add gimbal to external control signal

Move PreflightCheckList to custom builds only. The model, which used to be implemented within BuiltinPreFlightCheckModel is now within the control itself. It is up to the implementer to define a proper model.

New qml base log replay status bar

Restore QGC to its normal UI layout (buttons on toolbar)

Get rid of QGCView, QGCViewPanel and FactPanel. All messages and dialogs are now handled in the root window.

* QGCCheckListItem -> PreFlightCheckButton
* CheckList -> PreFlightCheckList