Remove elements from nested lists in module definitions which are commented out

Rainer Kartmannrequested to merge
fix/comments-in-lists-are-not-removed into main

Fixes #251 (closed)

The bug was remove_list_elem_if not being recursively passed in remove_items_if(), so comments from nested lists were not removed correctly.

Also added tests to detect such bugs in the future.

Edited by Christian Dreher

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