Caterpillar

Before I continue with the train of thought I started yesterday, I got two quick updates.

First, I wrapped up work on code updates for now. The second round of compiler cleanup was successful. At the end, the bug became very obvious. There are still quite a few problems with the current implementation, but nothing I'm inclined to address right here and now.

Second, I ended up implementing the syntax changes I've been thinking about recently. Functions now start with fn and end with end, and branch parameters are now delimited with commas.