ENH: Expose the widget state of the contour widget.
ENH: Expose the widget state of the contour widget.

Expose the widget state of the contour widget. This allows us to add
a few nodes and set the widget state to manipulate programmatically.

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