Allows Categories to share max items equipped

Adds CATEGORY.SharedCategory which can be used for something like
multiple player model categories.

Usage is CATEGORY.SharedCategory = 'Other category name'
and the other category needs to do the same.
Then make sure CATEGORY.AllowedEquipped are the same.
Allows Multiple categories to share equipped

Now you do
CATEGORY.SharedCategories = { "Trails", "Accessories" }
Tested and working for me
hurr

dumb check
Grammar Fix

because computers dont speak words
Merge pull request #135 from rejax/master

Added CATEGORY.SharedCategories.