WIP on mp_merge integration

...rdupilotmega/fixed_wing/widgets/ardupilot-heading-pid.qgw

qgroundcontrol.pro

src/configuration.h

src/main.cc

src/uas/UAS.cc

src/uas/UAS.h

src/uas/UASInterface.h

src/uas/UASManager.cc

src/uas/UASManager.h

src/ui/MainWindow.cc

src/ui/MainWindow.h

src/ui/QGCSettingsWidget.cc

src/ui/QGCSettingsWidget.ui

src/ui/designer/QGCComboBox.cc

src/ui/designer/QGCParamSlider.cc

src/ui/designer/QGCToolWidget.cc

src/ui/dockwidgettitlebareventfilter.cpp

src/ui/dockwidgettitlebareventfilter.h

src/ui/map/QGCMapWidget.cc

src/ui/map/QGCMapWidget.h