Added an "twig" lines mode, where the label lines are processed via a sandboxed twig.

src/Exceptions/TwigModeException.php

@@ -0,0 +1,33 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Exceptions;
+
+
+use Throwable;
+use Twig\Error\Error;
+
+class TwigModeException extends \RuntimeException
+{
+    public function __construct(Error $previous = null)
+    {
+        parent::__construct($previous->getMessage(), 0, $previous);
+    }
+}