Modernize MetaMTA

Summary:
  - Add an Application.
  - Move routes to the application.
  - Move nav out of tabs (which no longer exist).
  - Fix a couple of random things.

Test Plan: Viewed sent/received mail logs. Performed send/receive tests. Viewed email details.

Reviewers: btrahan, vrana

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T631, T1569

Differential Revision: https://secure.phabricator.com/D3255

src/applications/base/controller/PhabricatorController.php

@@ -149,17 +149,18 @@ abstract class PhabricatorController extends AphrontController {
 
     if (!($view instanceof AphrontSideNavFilterView)) {
       $nav = new AphrontSideNavFilterView();
-      if ($application) {
-        $nav->setCurrentApplication($application);
-      }
-      $nav->setUser($this->getRequest()->getUser());
-      $nav->setFlexNav(true);
-      $nav->setShowApplicationMenu(true);
       $nav->appendChild($view);
-
       $view = $nav;
     }
 
+    if ($application) {
+      $view->setCurrentApplication($application);
+    }
+
+    $view->setUser($this->getRequest()->getUser());
+    $view->setFlexNav(true);
+    $view->setShowApplicationMenu(true);
+
     $page->appendChild($view);
 
     $response = new AphrontWebpageResponse();