ENH: Provide overloaded versions of vtkTryDowncast that handle one, two, or three objects to be cast.
ENH: Provide overloaded versions of vtkTryDowncast that handle one, two, or three objects to be cast.

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