Idea for new, improved renderer:

- Break each line down into an array of objects, one object per character.  This should happen after UTF-8 conversion.
- Objects have properties for color, style, etc.
- ANSI converter runs through the array, removing control characters and setting appropriate styles.
- Catenate all the characters to get a 'stripped' string for pattern matching. *
- Run URL matches. Flag appropriate characters.
- Run trigger matches.  Set appropriate styles on the corresponding characters in the array, being careful not to split any URLs.
- Run through the array, re-assembling it.  Look for runs with the same styles or tags, and consolidate. *
  - Do HTML entities while re-assembling.


* May have performance implications. It looks like concatenation is faster than join() here, at least in Chrome.