Move most Differetial keyboard shortcuts into DiffChangesetList

Summary: Ref T12616. This moves most keyboard shortcuts into DiffChangesetList. It breaks some shortcuts that I plan to restore later, noted in T12616 (toggle file, edit inline, reply to inline), since I think ripping them out now and rebuilding them in a little bit will make things much simpler.

Test Plan:
  - Used j, k, n, p, J, K shortcuts to navigate a revision.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12616

Differential Revision: https://secure.phabricator.com/D17859

src/applications/diffusion/controller/DiffusionCommitController.php

@@ -720,8 +720,6 @@ final class DiffusionCommitController extends DiffusionController {
     $request = $this->getRequest();
     $viewer = $request->getUser();
 
-    Javelin::initBehavior('differential-keyboard-navigation');
-
     // TODO: This is pretty awkward, unify the CSS between Diffusion and
     // Differential better.
     require_celerity_resource('differential-core-view-css');