Introduce some convenience methods for handle rendering
Summary:
So I don't have to copy/paste everything again.
Used them at places I could find with my limited grep skills.
Test Plan: Visited hovercards, revision and tasks. No crashes.
Reviewers: epriestley, btrahan, chad
Reviewed By: epriestley
CC: aran, Korvin
Differential Revision: https://secure.phabricator.com/D5592