* switch to composer for qrcode and otp dependencies

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

vendor/thecodingmachine/safe/generated/rrd.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Safe;
+
+use Safe\Exceptions\RrdException;
+
+/**
+ * Creates the rdd database file.
+ *
+ * @param string $filename Filename for newly created rrd file.
+ * @param array $options Options for rrd create - list of strings. See man page of rrd create
+ * for whole list of options.
+ * @throws RrdException
+ *
+ */
+function rrd_create(string $filename, array $options): void
+{
+    error_clear_last();
+    $result = \rrd_create($filename, $options);
+    if ($result === false) {
+        throw RrdException::createFromPhpError();
+    }
+}