Add inline comments to the web view of Diffusion / Audit

Summary: Depends on D1928. Uses the new UI element to display inlines in Diffusion.

Test Plan: Looked at a commit with inline comments, saw them in the summaries.

Reviewers: davidreuss, nh, btrahan

Reviewed By: davidreuss

CC: aran, epriestley

Maniphest Tasks: T904

Differential Revision: https://secure.phabricator.com/D1929