Update Sunburst.

- Fix up some color names and values.
- Add highlighting for single-characters, escape codes in strings, and
  standard C/C++ functions.
- Remove some ill-advised interface highlights.
Update my config.

- Use my favorite font.
- Add a better C/C++ highlighter plugin.
- Add a function that tells me the highlight under the cursor.
- Update Ctrl-P plugin to something more up-to-date.