Do not hang ParaView during computation

From a user voice request and request.

Abort filters and rendering without having to quit paraview (Bug 3925)

Some filters can take very long to finish. Also large datasets might take forever to render. It would be great if a user could press a stop button to stop these processes without having to kill paraview.

Dev note: A button for this exist, but It cannot be clicked buring computation.

Don’t hang the client during Filter/Reader/Writer execution

It would be nice if the user could still use the UI while the servers are working.

Corollary: Progress bars!

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This is not as simple as it seems and may requires to make ParaView GUI thread separate to the main compute thread.

FYI @utkarsh.ayachit