Implement most of the administrative UI for approval queues

Summary:
Nothing fancy here, just:

  - UI to show users needing approval.
  - "Approve" and "Disable" actions.
  - Send "Approved" email on approve.
  - "Approve" edit + log operations.
  - "Wait for Approval" state for users who need approval.

There's still no natural way for users to end up not-approved -- you have to write directly to the database.

Test Plan: See screenshots.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7573

src/applications/people/controller/PhabricatorPeopleDisableController.php

@@ -0,0 +1,48 @@
+<?php
+
+final class PhabricatorPeopleDisableController
+  extends PhabricatorPeopleController {
+
+  private $id;
+
+  public function willProcessRequest(array $data) {
+    $this->id = idx($data, 'id');
+  }
+
+  public function processRequest() {
+
+    $request = $this->getRequest();
+    $admin = $request->getUser();
+
+    $user = id(new PhabricatorPeopleQuery())
+      ->setViewer($admin)
+      ->withIDs(array($this->id))
+      ->executeOne();
+    if (!$user) {
+      return new Aphront404Response();
+    }
+
+    $done_uri = $this->getApplicationURI('query/approval/');
+
+    if ($request->isFormPost()) {
+      id(new PhabricatorUserEditor())
+        ->setActor($admin)
+        ->disableUser($user, true);
+
+      return id(new AphrontRedirectResponse())->setURI($done_uri);
+    }
+
+    $dialog = id(new AphrontDialogView())
+      ->setUser($admin)
+      ->setTitle(pht('Confirm Disable'))
+      ->appendChild(
+        pht(
+          'Disable %s? They will no longer be able to access Phabricator or '.
+          'receive email.',
+          phutil_tag('strong', array(), $user->getUsername())))
+      ->addCancelButton($done_uri)
+      ->addSubmitButton(pht('Disable Account'));
+
+    return id(new AphrontDialogResponse())->setDialog($dialog);
+  }
+}