[vtkusers] Copy/duplicate vtkActor

[StephenWei]

It seems there is no DeepCopy interface in class vtkActor.
We can create our own DeepCopy refers to `void vtkActor::ShallowCopy(vtkProp
*prop)`:
Create independent mapper, Property, Texture and etc for the new vtkActor
object. And set origin, position, Orientation and UserTransform for it.



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