Better mission item indicators, fix click to set waypoint

src/FlightMap/MapItems/MissionItemIndicator.qml

src/MissionEditor/FWLandingPatternMapVisual.qml

src/MissionEditor/MissionItemEditor.qml

src/MissionEditor/MissionItemStatus.qml

src/MissionEditor/MissionSettingsMapVisual.qml

src/MissionEditor/SimpleItemMapVisual.qml

src/MissionEditor/SurveyMapVisual.qml

src/MissionManager/SimpleMissionItem.cc

src/MissionManager/VisualMissionItem.h

src/QmlControls/MissionItemIndexLabel.qml