Simple way to delete users and their content

[BurntimeX]

Up until now, there have been two different functions, which makes deleting a user and their content cumbersome.

ref https://www.woltlab.com/community/thread/307012-bei-benutzerl%C3%B6schung-auch-inhalte-l%C3%B6schen/?postID=1972947#post1972947