$user: User object representing user contributions are being fetched for
$sp: SpecialPage instance, providing context
+'SpecialContributions::getForm::filters': Called with a list of filters to render
+on Special:Contributions.
+$sp: SpecialContributions object, for context
+&$filters: List of filters rendered as HTML
+
'SpecialListusersDefaultQuery': Called right before the end of
UsersPager::getDefaultQuery().
$pager: The UsersPager instance