Merge branch 'Modernise_Interaction_2' into 'master'

src/Cxx/Interaction/Game.cxx

src/Cxx/Interaction/MoveAGlyph.cxx

src/Cxx/Interaction/MoveAGlyph.md

src/Cxx/Interaction/MoveAVertexUnstructuredGrid.cxx

src/Cxx/Interaction/ObserverMemberFunction.cxx

src/Cxx/Interaction/ObserverMemberFunction.md

src/Cxx/Interaction/PickableOff.cxx

src/Cxx/Interaction/Picking.cxx

src/Cxx/Interaction/PointPicker.cxx

src/Cxx/Interaction/PointPicker.md

src/Cxx/Interaction/RubberBand2D.cxx

src/Cxx/Interaction/RubberBand2D.md

src/Cxx/Interaction/RubberBand2DObserver.cxx

src/Cxx/Interaction/RubberBand3D.cxx

src/Cxx/Interaction/RubberBandPick.cxx

src/Cxx/Interaction/RubberBandPick.md

src/Cxx/Interaction/RubberBandZoom.cxx

src/Cxx/Interaction/RubberBandZoom.md

src/Cxx/Interaction/SelectAVertex.cxx

src/Cxx/Interaction/SelectAVertex.md