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* [FIX] tests: The calendar recurrence tests fail when categories are enabled due to a9a804ff to disable them for now (the `$_REQUEST` values probably shouldn't be used in `\CalendarLib::set_item`?)

* [FIX] prefs: Add defaults for `unified_included_plugins` (thanks Volker)

* [FIX] installer: Correct type for $oldDefault (can be string, array etc) and add php8 type declarations

* [FIX] tests: Skip toolbar tests as they're far too fragile (were useful during refactoring a while ago but a better strategy is needed for the future)

* [RB] prefs: feature_jquery_tablesorter remains disabled by default (thanks @marclaporte - more on https://tiki.org/blogpost970-TableSorter)

* [FIX] prefs: Add script to preserve existing defaults (hope i didn't miss any!)

* [FIX] prefs: Address some feedback on !4507 (sefurl, codemirror and files in database)

* [MOD] prefs: Last lot of default changes suggested on https://dev.tiki.org/Tiki27-Pref-Changes-Discussion

* [MOD] prefs: Next lot of miscellaneous pref changes

* [MOD] prefs: Tracker field default changes (some of these are probably too advanced)

* [MOD] prefs: First part of implementing https://dev.tiki.org/Tiki27-Pref-Changes-Discussion

See merge request !4507