Summary:
I want to add comments to commits, and they should obviously share code with the
nearly-identical comments in Maniphest and Differential. Unify code/style as
much as possible.
This program made possible by a generous grant from D1513.
Test Plan:
- Looked at a bunch of different Differential and Maniphest comments; they
appeared to render identically to how they looked before.
- Tested some edge cases like anchors and "show details" on description edits
in Maniphest.
Reviewers: btrahan, jungejason
Reviewed By: btrahan
CC: aran, epriestley
Maniphest Tasks: T904
Differential Revision: https://secure.phabricator.com/D1686
