Merge pull request #834 from DonLakeFlyer/ThreadingFixes

libs/opmapcontrol/src/mapwidget/mapgraphicitem.cpp

src/comm/ParameterList.cc

src/uas/QGCUASParamManager.cc

src/uas/QGCUASParamManager.h

src/uas/UAS.cc

src/uas/UASParameterCommsMgr.cc

src/uas/UASParameterCommsMgr.h

src/uas/UASParameterDataModel.cc

src/uas/UASWaypointManager.cc

src/uas/UASWaypointManager.h

src/ui/QGCPX4VehicleConfig.cc

src/ui/QGCVehicleConfig.cc

src/ui/designer/QGCParamSlider.cc

src/ui/map3D/Pixhawk3DWidget.cc

src/ui/map3D/Pixhawk3DWidget.h

src/ui/map3D/Q3DWidget.h

src/ui/px4_configuration/QGCPX4SensorCalibration.cc