TODO: Support reading from multiple files?

Still needs actual functionality, but this way things are a bit cleaner.

Use an interator for arguments, and generally clean up handling of said
arguments.

Mention R7RS-small, and wrap long lines.

We are starting with basic integer math. We'll get more complex, but we should
start simple.

Very very very much subject to change.

Based on https://ftp.cs.wpi.edu/pub/techreports/pdf/05-07.pdf §3.3.

This way the rodent-smile-emoji shows up in a fixed-width font when rendered,
_and_ looks good in plaintext as well. :>

Well, "parsing" might be a stretch. We read a filename, and also support the
requisite -[-h]elp and -[-v]ersion flags.

Default project template, minus a lot of superfluous comments and whatnot.

Contents subject to change, ofc.