* 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/lzf.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace Safe;
+
+use Safe\Exceptions\LzfException;
+
+/**
+ * lzf_compress compresses the given
+ * data string using LZF encoding.
+ *
+ * @param string $data The string to compress.
+ * @return string Returns the compressed data.
+ * @throws LzfException
+ *
+ */
+function lzf_compress(string $data): string
+{
+    error_clear_last();
+    $result = \lzf_compress($data);
+    if ($result === false) {
+        throw LzfException::createFromPhpError();
+    }
+    return $result;
+}
+
+
+/**
+ * lzf_compress decompresses the given
+ * data string containing lzf encoded data.
+ *
+ * @param string $data The compressed string.
+ * @return string Returns the decompressed data.
+ * @throws LzfException
+ *
+ */
+function lzf_decompress(string $data): string
+{
+    error_clear_last();
+    $result = \lzf_decompress($data);
+    if ($result === false) {
+        throw LzfException::createFromPhpError();
+    }
+    return $result;
+}