R1:02cd235b3d61

Add PasteArchiveController

Summary: Makes this more consistent. Also clean up spacing. Ref T9414

Test Plan: Archive/Activate Paste, Edit Paste

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T9414

Differential Revision: https://secure.phabricator.com/D14724