Use color.c to print ANSI colors.

- Use modocache/color.c to print ANSI escaped color strings.
- Print `DESCRIBE_FAIL` in red, not gray.

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I whipped up a small package to handle ANSI color codes. It can be used in [stephenmathieson/clib-package](https://github.com/stephenmathieson/clib-package), too, but first I thought I'd get your opinion on it here. Let me know what you think! :neckbeard: