R1:424ba2e58887

Render inline comments in "Pro" mail

Summary: Ref T2222. This enriches mail a little bit to get these rendering pretty much like they do now.

Test Plan: {F118255}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2222

Differential Revision: https://secure.phabricator.com/D8343