Add admin editable username, email and mod name filter wordlist

[V1TA5]

To stop spam and hormone heavy teens going overboard have a wordlist that can be edited by admins and that is applied to modnames, email and usernames (maybe selector to apply it to some and not all of them per word?)

Do we want to warn people when submiting forms with those words that we dont accept their entry and block them before they are created?

[HebaruSan]

Hmm, a warning might result in a spammer simply looking up synonyms from a thesaurus.

User: Mumbai Escorts 69 420 4eva
Site: You said "escort", that's not allowed
User: OK, I'm a "sexual services expert"
Site: You said "sexual", that's not allowed
User: How about "intimate services expert"
Site: OK!
User: Hooray! Spam achieved!

I would definitely think we simply wouldn't create the user on the server side, maybe sending the user to a 404 page.

Two things I'm planning to make cleanup somewhat easier:

• In the admin page user list, preserve the text search after deleting a user so you can stay on the same list
• Checkboxes to perform a mass-delete without having to enter the usernames

I don't think we have to worry about mod names, spam in those has been extremely rare to non-existent.

And I'd definitely apply the filter to user descriptions. That's where the spammiest spam occurs.