Add feature to allow users to specify a window title for the GUI

When using multiple PV GUIs simultaneously, especially with similar datasets and analyses, it can be confusing to quickly determine which GUI is doing what. It would be good to allow the user to specify a window title to allow them to easily identify what each PV GUI is doing.

This should probably be allowed to be done 2 ways:

Through an environment variable like > PARAVIEW_WINDOW_TITLE="Some Name" ./bin/paraview
Through the PV Edit menu with an entry called something like Set Window Title

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