SwissQR: add Sprain\SwissQrBill and dependencies

htdocs/includes/symfony/validator/ConstraintValidatorInterface.php

@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Validator;
+
+use Symfony\Component\Validator\Context\ExecutionContextInterface;
+
+/**
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+interface ConstraintValidatorInterface
+{
+    /**
+     * Initializes the constraint validator.
+     */
+    public function initialize(ExecutionContextInterface $context);
+
+    /**
+     * Checks if the passed value is valid.
+     */
+    public function validate(mixed $value, Constraint $constraint);
+}