Additional: Add support for packaging additional python modules

Mathieu Westphal (Kitware)requested to merge
mwestphal/paraview-superbuild:additional_python_modules into master

Add the possibility to easily package additional python modules using the ADDITIONAL_SUPERBUILD infra.

See paraview-additional-superbuild-example!3 (merged) for an example

Edited by Mathieu Westphal (Kitware)

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