Pholio - render inline comments together in an email

Summary: Used Differential emails as a formatting guide. This also includes "Image X: <inline comment>" similarly to how Differential has "<file path><line(s)>: <inline comment>" or what have you. Fixes T3138.

Test Plan: inserted some debugging code and verified the mail body format looked okay ish

Reviewers: epriestley, chad

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T3138

Differential Revision: https://secure.phabricator.com/D6258