TODOs for IRC control codes that I have been able to find.
Updated comments w.r.t. return values.
Tests specifying desired control code parsing behavior.
Support for IRC control codes.

The following IRC control codes are now supported:
* Bold
* Italics
* Underline
* Normal (clears all outstanding codes)
* Color (foreground and background)
* 16 colors (00 up to and including 15)