[vtkusers] Update temporal pipeline in Java

[Gerrick Bivins]

Hi All,
I have a temporal pipeline setup and I¹m able to sequentially display the
timesteps. Works great.
Next I¹d like to do the following:
1. Allow user interaction via interactor while the pipeline is updating
2. Allow user to interrupt (or pause) at a specific time step
I have the framework setup so that I can update the temporal pipeline
separately from the graphics BUT to update the graphics, I need to trigger a
render.