added export context (#2216)

src/Export/ExportContext.php

@@ -0,0 +1,37 @@
+<?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\Export;
+
+/**
+ * A simple class that is available in twig renderer context, which can be used to define global renderer options.
+ */
+final class ExportContext
+{
+    private $options = [];
+
+    public function setOption(string $key, string $value): void
+    {
+        $this->options[$key] = $value;
+    }
+
+    public function getOptions(): array
+    {
+        return $this->options;
+    }
+
+    public function getOption(string $key): ?string
+    {
+        if (\array_key_exists($key, $this->options)) {
+            return $this->options[$key];
+        }
+
+        return null;
+    }
+}