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Use EditEngine stacked comments in Diffusion

Description

Use EditEngine stacked comments in Diffusion

Summary: Ref T10978. Ref T8739. Fixes T10446. Converts Diffusion to modern comment/preview code, like Differential.

Test Plan:

Screen Shot 2017-01-11 at 2.22.49 PM.png (1×1 px, 233 KB)

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10978, T10446, T8739

Differential Revision: https://secure.phabricator.com/D17183