performance improvements (#2329)

* remove work from constructor
* refactor twig extensions
* upgrade theme
* replace sub-request with direct template rendering

src/Twig/Runtime/ThemeExtension.php

@@ -0,0 +1,62 @@
+<?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\Twig\Runtime;
+
+use App\Entity\User;
+use App\Event\ThemeEvent;
+use App\Event\ThemeJavascriptTranslationsEvent;
+use Symfony\Bridge\Twig\AppVariable;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Twig\Environment;
+use Twig\Extension\RuntimeExtensionInterface;
+
+final class ThemeExtension implements RuntimeExtensionInterface
+{
+    /**
+     * @var EventDispatcherInterface
+     */
+    private $eventDispatcher;
+
+    public function __construct(EventDispatcherInterface $dispatcher)
+    {
+        $this->eventDispatcher = $dispatcher;
+    }
+
+    /**
+     * @param Environment $environment
+     * @param string $eventName
+     * @param mixed|null $payload
+     * @return ThemeEvent
+     */
+    public function trigger(Environment $environment, string $eventName, $payload = null): ThemeEvent
+    {
+        /** @var AppVariable $app */
+        $app = $environment->getGlobals()['app'];
+        /** @var User $user */
+        $user = $app->getUser();
+
+        $themeEvent = new ThemeEvent($user, $payload);
+
+        if ($this->eventDispatcher->hasListeners($eventName)) {
+            $this->eventDispatcher->dispatch($themeEvent, $eventName);
+        }
+
+        return $themeEvent;
+    }
+
+    public function getJavascriptTranslations(): array
+    {
+        $event = new ThemeJavascriptTranslationsEvent();
+
+        $this->eventDispatcher->dispatch($event);
+
+        return $event->getTranslations();
+    }
+}