Allow diffing of config files and regendata#529

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merijn wants to merge 3 commits intohaskell-CI:masterfrom

Commits on Dec 21, 2020

Generate a diff between two sets of options.
merijn
committed

Commits on Aug 2, 2021

Initial diff command.
merijn
committed

Commits on Aug 24, 2022

Fix breakage due to changes on master.
merijn
committed