* switch to composer for qrcode and otp dependencies

* move most OTP-related stuff into userhelper
* remove old phpqrcode and otphp libraries

vendor/beberlei/assert/lib/Assert/AssertionFailedException.php

@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * Assert
+ *
+ * LICENSE
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this package in the file LICENSE.txt.
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to kontakt@beberlei.de so I can send you a copy immediately.
+ */
+
+namespace Assert;
+
+use Throwable;
+
+interface AssertionFailedException extends Throwable
+{
+    /**
+     * @return string|null
+     */
+    public function getPropertyPath();
+
+    /**
+     * @return mixed
+     */
+    public function getValue();
+
+    /**
+     * @return array
+     */
+    public function getConstraints(): array;
+}