ENH: changed ActorMode and TrackballMode accessor functions to virtual
ENH: changed ActorMode and TrackballMode accessor functions to virtual

gram526/VTK,daviddoria/PointGraphsPhase1,cjh1/VTK,mspark93/VTK,arnaudgelas/VTK,cjh1/VTK,gram526/VTK,hendradarwin/VTK,msmolens/VTK,msmolens/VTK,johnkit/vtk-dev,hendradarwin/VTK,berendkleinhaneveld/VTK,gram526/VTK,sankhesh/VTK,ashray/VTK-EVM,sgh/vtk,mspark93/VTK,sankhesh/VTK,Wuteyan/VTK,aashish24/VTK-old,collects/VTK,mspark93/VTK,candy7393/VTK,Wuteyan/VTK,daviddoria/PointGraphsPhase1,mspark93/VTK,ashray/VTK-EVM,demarle/VTK,jeffbaumes/jeffbaumes-vtk,sumedhasingla/VTK,candy7393/VTK,biddisco/VTK,aashish24/VTK-old,hendradarwin/VTK,mspark93/VTK,keithroe/vtkoptix,ashray/VTK-EVM,arnaudgelas/VTK,SimVascular/VTK,berendkleinhaneveld/VTK,johnkit/vtk-dev,berendkleinhaneveld/VTK,berendkleinhaneveld/VTK,keithroe/vtkoptix,demarle/VTK,candy7393/VTK,demarle/VTK,keithroe/vtkoptix,mspark93/VTK,aashish24/VTK-old,candy7393/VTK,cjh1/VTK,spthaolt/VTK,Wuteyan/VTK,keithroe/vtkoptix,spthaolt/VTK,biddisco/VTK,hendradarwin/VTK,gram526/VTK,jmerkow/VTK,ashray/VTK-EVM,gram526/VTK,berendkleinhaneveld/VTK,mspark93/VTK,sgh/vtk,ashray/VTK-EVM,sankhesh/VTK,sankhesh/VTK,mspark93/VTK,cjh1/VTK,candy7393/VTK,jmerkow/VTK,spthaolt/VTK,msmolens/VTK,hendradarwin/VTK,SimVascular/VTK,cjh1/VTK,naucoin/VTKSlicerWidgets,msmolens/VTK,sgh/vtk,sumedhasingla/VTK,berendkleinhaneveld/VTK,spthaolt/VTK,sgh/vtk,sankhesh/VTK,keithroe/vtkoptix,jmerkow/VTK,SimVascular/VTK,SimVascular/VTK,jmerkow/VTK,demarle/VTK,arnaudgelas/VTK,jeffbaumes/jeffbaumes-vtk,keithroe/vtkoptix,jeffbaumes/jeffbaumes-vtk,sumedhasingla/VTK,msmolens/VTK,sankhesh/VTK,johnkit/vtk-dev,jmerkow/VTK,arnaudgelas/VTK,collects/VTK,sankhesh/VTK,naucoin/VTKSlicerWidgets,collects/VTK,naucoin/VTKSlicerWidgets,sumedhasingla/VTK,jmerkow/VTK,jeffbaumes/jeffbaumes-vtk,biddisco/VTK,johnkit/vtk-dev,sgh/vtk,johnkit/vtk-dev,demarle/VTK,candy7393/VTK,daviddoria/PointGraphsPhase1,Wuteyan/VTK,biddisco/VTK,Wuteyan/VTK,keithroe/vtkoptix,jmerkow/VTK,johnkit/vtk-dev,naucoin/VTKSlicerWidgets,spthaolt/VTK,sumedhasingla/VTK,hendradarwin/VTK,sumedhasingla/VTK,demarle/VTK,gram526/VTK,sumedhasingla/VTK,spthaolt/VTK,johnkit/vtk-dev,sumedhasingla/VTK,candy7393/VTK,biddisco/VTK,Wuteyan/VTK,jeffbaumes/jeffbaumes-vtk,aashish24/VTK-old,biddisco/VTK,gram526/VTK,jeffbaumes/jeffbaumes-vtk,ashray/VTK-EVM,msmolens/VTK,SimVascular/VTK,candy7393/VTK,arnaudgelas/VTK,msmolens/VTK,Wuteyan/VTK,demarle/VTK,biddisco/VTK,aashish24/VTK-old,arnaudgelas/VTK,daviddoria/PointGraphsPhase1,sankhesh/VTK,ashray/VTK-EVM,keithroe/vtkoptix,ashray/VTK-EVM,aashish24/VTK-old,daviddoria/PointGraphsPhase1,collects/VTK,jmerkow/VTK,SimVascular/VTK,hendradarwin/VTK,daviddoria/PointGraphsPhase1,demarle/VTK,sgh/vtk,spthaolt/VTK,naucoin/VTKSlicerWidgets,collects/VTK,naucoin/VTKSlicerWidgets,berendkleinhaneveld/VTK,cjh1/VTK,gram526/VTK,SimVascular/VTK,msmolens/VTK,SimVascular/VTK,collects/VTK