[overtime] The greatest treasure was within you all along

Another overtime update, another missed goal.

I'm still fighting to make treasure and treasure value work some way I like.  I've made some major architectural changes and reverted them more than once, and I think I'm closing in on a solution.

In the meantime, I'm just stuffing a treasure component into creatures so they can grant XP when they die.  That seems like a good way to approach this.

This means that the Fighter component is messing with the Treasure component and I'm not sure I like that, but it's better than nothing.