VTK - start working on preparing for a combine - swapContent API-alike for multiple inputfields (and refactor)
VTK - start working on preparing for a combine - swapContent API-alike for multiple inputfields (and refactor)

vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk