Feature request: Clone renderView

[bastian]

I have added the following features:

• clone additional lights
• clone scalarbar properties

I no longer observe this issue in Paraview 5.9.1:

@bastian

Once the RenderView is cloned, changing the Color Palette only ever affects the first RenderView and it seems to be impossible to change the Color Palette active in the clones.
So bear in mind that if you plan on changing the Color Palette, do so before cloning the RenderView.

https://gist.github.com/baloe/a6ccd18e6380dbcae094566f50e26d45