R1:7c2a7d03651c

Modernize remaining edge types

Summary: Modernize remaining edges to subclass `PhabricatorEdgeType`. Largely based on D11045.

Test Plan: Browsed around and performed various actions include subscribing, unsubscribing and watching.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D11116