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