Rewrite script based on review feedback

After starting to address a few comments, I basically realized I needed
a new approach. I by and large kept the structure the same, but have
revised the library usage to ust use things from the standard library.

I've slightly modified some of the initial classes to be provide more
useful abstractions. There's probably room for more improvements, but
I wanted to keep this as simple as possible.

Author: ilovepi