performance improvements (#2329)

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

tests/Twig/Runtime/TimesheetExtensionTest.php

@@ -0,0 +1,33 @@
+<?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\Tests\Twig\Runtime;
+
+use App\Entity\Timesheet;
+use App\Entity\User;
+use App\Repository\TimesheetRepository;
+use App\Twig\Runtime\TimesheetExtension;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @covers \App\Twig\Runtime\TimesheetExtension
+ */
+class TimesheetExtensionTest extends TestCase
+{
+    public function testGetExporter()
+    {
+        $entries = [new Timesheet(), new Timesheet()];
+
+        $repository = $this->createMock(TimesheetRepository::class);
+        $repository->method('getActiveEntries')->willReturn($entries);
+
+        $sut = new TimesheetExtension($repository);
+        self::assertEquals($entries, $sut->activeEntries(new User()));
+    }
+}