History: Orphan preferences

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            New in ((Tiki25)), it permits to clean out ((Preferences)) for previously used but later removed features in Tiki.

__As of Tiki25, please consider this feature as experimental. Only use it if you are an experienced Tiki administrator.__

There is likely some data here that is actually still used, but in a non-standard way, so it fools our script.

Initial commit:
https://gitlab.com/tikiwiki/tiki/-/merge_requests/1798