Abuse filter management

Imported from https://en.wikipedia.org/wiki/Special:AbuseFilter/803, but some changes are as they follow:

* Anonymous and non-confirmed users may not edit user pages; confirmed users and sysops can edit said pages.

* For the users in these latter groups, they may not add the template {{unlocked userpage}} on another user's user page; it may only be done by the user themselves or a steward.

* No User:Sandbox user exists, so it was removed. --64andtim 18:56 29 Jan 2024

page_namespace == 2 &

!('/' in page_title) &

page_title != user_name & (

     template := "{{unlocked userpage}}";

     (

         !(template in old_wikitext)

     ) | (

         (

             (

                 removed_lines contains template &

                 !(template in added_lines)

             ) | (

                 added_lines contains template &

                 !(template in removed_lines)

             )

         ) &

         !("steward" in user_groups)

     )

)