Feature: Item Randomization

This was done in a previous version of SSBMR, but I think I unfortunately lost the code. Whoops, my b. It was probably in v0.3. Hitboxes for Items (and everything considered to be an Item, like enemies in Adventure Mode) are contained within PlCo.dat. We would have to find all the hitboxes within through whatever means works best and then tag them and add them to the pool of all Hitboxes (hitbox.py).

It might be possible to cleanly go through PlCo.dat by traversing through the Nodes within the dat file format. But this requires a lot more in depth knowledge of DAT files and probably isn't necessary or worth it for our purposes. pl_common.py could be a good script to handle Item randomization in.