Parser Engine

[jpaugh]

The current parser (braille.convert) is too brittle.

• It only supports processing a single line
• It processes one word at a time, with no fore/back references.
• No support for file input/output

What we need is a scanner that consumes tokens into a tree, and a parser than can traverse and manipulate that tree arbitrarily. I'm sure someone's already made something like that, but it'd be a fun project nonetheless.