Include "Add CCs" and "Remove CCs" to batch editor
Summary:
Ref T2756
... didn't update celerity map, I'm on windows :)
Test Plan: Add CCs, Remove CCs, make sure everything else works.
Reviewers: epriestley
CC: aran, Korvin
Maniphest Tasks: T2756
Differential Revision: https://secure.phabricator.com/D5589