Generate syntax highlighting CSS from a reusable map
Ref T9790. This prepares the syntax color rules to be reused in mail.
This goes about halfway toward T5701 by sort-of supporting different styles but not really.
- Ran bin/celerity syntax to regenerate syntax map.
- Viewed some highlighted code, didn't see any differences.
Reviewed By: chad
Maniphest Tasks: T9790
Differential Revision: https://secure.phabricator.com/D15846