Begin fixing badge numbers

Changes the 8.5 badge numbers, and starts making uber check if they're in range when shifting them up or down.

This isn't a very good solution, but we can use this to fix the staff and supporter badges and make them adhere to the new numbers. Basically, you can select "next available badge" on a Supporter or Staff badge, and it will fix all those badges' numbers... except the one you're actually changing.
Just a quick sanity check: did you mean to say ``a`` or ``attendee`` here?