Attribute Colors

Created the ability for item attributes to change the color of items
they are added to. For now, I have only added Hold as purple, Blind as
black, and Purge as yellow. Opponents will now be able to discern the
type of weapon they are facing.

Also, the weapons will be their color even unrevealed. This is for the longstanding player request for something to help them pick out useful magic weapons from a huge pile of loot.