ColorCodes: simplify and comment a bit.

- Simplify logic and increase explanation to make it easier
  for the casual reader.
- Remove the undocumented, untested and not-clearly-working
  "percentage" support.
- Replace `eval` with `try`, as is my wont.

Addresses #620.
ColorCodes: allow for rgb #123456-style queries
ColorCodes: rough in a different HTML template.

Real templates are coming, but this is a step.
Merge pull request #625 from mwmiller/color_sanity

ColorCodes: simplify and comment a bit.
Move goodies to new styling mechanism.

- Rename 'style.css' to appropriate ID-based name.
- Remove explicit inclusion of CSS, as it will now be auto-included.
- Update tests which explicitly checked for styling.
SHA: move from inline CSS.
ValarMorghulis: move from inline CSS.
Dice: move from inline CSS.
Unifornify: move from inline CSS.
UltimateAnswer: remove trailing whitespace.
UltimateAnswer: move from inline css
ColorCodes: move from inline css
ResistorColors: move from inline CSS.