Three Dollar Quill

Okay, so. I've laid the groundwork for tracking matrix dependencies, but I haven't yet made the decision for exactly how to implement some of the details. Like, okay, I need to track dependencies in the Axes, and have the correct logic for propagating dependencies up, along with the new "injected values" concept, but once I have support for that in the matrix module, I'm not sure what the sensible way will be to call that new functionality in the artifact module.

I'll see if I can get something done with this tomorrow, but for now I should be getting ready for bed.

Good night.