R1:19aac8e8d3be

Pass the new default syntax highlighting map to the remarkup engine

Summary: Ref T9790. This passes the map down so we can generate highlighted mail.

Test Plan:
Generated this relatively respectable-looking HTML mail:

{F1258558}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9790

Differential Revision: https://secure.phabricator.com/D15848