Chipping Away at Features

I'm slowly chipping away at features needed before PIGCON...

You can now make a Group of Actions. This opens up a lot of things for Action Sequences. Basically a Group of Actions is just a little bundle of Actions that all play out together. This is useful for, say, Pick a Random Action where it picks one random Action out of its list. Now, however, that one Action can be a Group of Actions. With the addition of this new Action, I have added a new recipe in the documentation for making a treasure chest.

Another change is that Item counts can now go below zero. Originally the idea for Items was to have it mirror very strictly the idea of an actual item, of which you'd never be able to have negative items. Like, "I have -3 apples." But, since Items end up being useful as variables, it makes sense to allow them to go below zero.