$nt: new title
$user: user who does the move
+'TitleMoveStarting': Before moving an article (title), but just after the atomic DB section starts.
+$old: old title
+$nt: new title
+$user: user who does the move
+
'TitleMoveComplete': After moving an article (title), post-commit.
&$old: old title
&$nt: new title