Admin tool refactoring

[Apogate]

This is only the beginning, this one is gonna take quite some time.

So far:

Added:

Changed:

• Minor security for ?res= redirection, cleaned up some unnecessary bits

Removed:

• Banned.php as a root level file. You can now check all bans for any board via imgboard.php?mode=banned

[RePod]

"With all those deletions, RePod must have had a part in it."

I'm innocent.