enhanced plugin support (#634)

- refactored admin controller and templates
- plugin support for entity actions
- changed column mail to email in customer table
- refactored theme events

src/Controller/NavbarController.php

@@ -0,0 +1,60 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Controller;
+
+use App\Repository\ActivityRepository;
+use Sensio\Bundle\FrameworkExtraBundle\Configuration\Security;
+use Symfony\Component\HttpFoundation\Response;
+
+/**
+ * Controller used to manage navigation-bar contents.
+ *
+ * @Security("is_granted('ROLE_USER')")
+ */
+class NavbarController extends AbstractController
+{
+    /**
+     * @var ActivityRepository
+     */
+    private $repository;
+
+    /**
+     * @param ActivityRepository $repository
+     */
+    public function __construct(ActivityRepository $repository)
+    {
+        $this->repository = $repository;
+    }
+
+    /**
+     * @return ActivityRepository
+     */
+    protected function getRepository()
+    {
+        return $this->repository;
+    }
+
+    /**
+     * The flyout to render recent activities and quick-start new recordings.
+     *
+     * @return Response
+     * @throws \Doctrine\ORM\Query\QueryException
+     */
+    public function recentActivitiesAction()
+    {
+        $user = $this->getUser();
+        $entries = $this->getRepository()->getRecentActivities($user, new \DateTime('-1 year'));
+
+        return $this->render(
+            'navbar/recent-activities.html.twig',
+            ['entries' => $entries]
+        );
+    }
+}