prune module_list.py of dead extensions #4663
Description
After the cleanup from #4661 there are still various commented out Extensions in module_list. While some of those will come in potentially useful audit the files and remove potentially dead and terrible code while keeping around the good bits for resurrection.
Cheers,
Michael
Component: build
Reviewer: Jeroen Demeyer
Issue created by migration from https://trac.sagemath.org/ticket/4663