More Pythonic VTK wrapping

[amaclean (Andrew Maclean)]

@ahernsean

ren = vtkRenderer(background=colors.GetColor3d('BkgColor'),
                  actors=[ca])

Generates an: AttributeError: attribute 'actors' of 'vtkmodules.vtkRenderingCore.vtkRenderer' objects is not writable

@ahernsean

ren_win = vtkRenderWindow(size=[300,300],
                          window_name='CylinderExample',
                          renderer=ren)

I actually tried renderers= however this error is generated: AttributeError: attribute 'renderers' of 'vtkmodules.vtkRenderingCore.vtkRenderWindow' objects is not writable

@ahernsean

iren = vtkRenderWindowInteractor(render_window=ren_win)

Works but it is flagged as an unexpected argument in PyCharm.

Thanks for the comments.