[REVIEW/DO NOT MERGE]

Adds two new traitor items:

- Chameleon box
    It's a box. You scan stuff with it and the box turns into that stuff. Awesome, no? (Can be used for more than just hiding shit, if you're creative)

- Mailman jumpsuit
    Allows you to set it's mail tag so you can mail yourself anywhere. You can only change the tag while it's in your hand.

These items aren't in uplinks yet, because I have no idea how much they should cost. I was thinking 4TC for the mailman jumpsuit and 1 or 2 TC for the chameleon box.
Both are shamelessly copied from goon.
(sprite, desc and name for mailman jumpsuit coming in a commit very soon)