* switch to composer for qrcode and otp dependencies

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

vendor/chillerlan/php-qrcode/src/Data/AlphaNum.php

@@ -0,0 +1,65 @@
+<?php
+/**
+ * Class AlphaNum
+ *
+ * @filesource   AlphaNum.php
+ * @created      25.11.2015
+ * @package      chillerlan\QRCode\Data
+ * @author       Smiley <smiley@chillerlan.net>
+ * @copyright    2015 Smiley
+ * @license      MIT
+ */
+
+namespace chillerlan\QRCode\Data;
+
+use chillerlan\QRCode\QRCode;
+
+use function array_search, ord, sprintf;
+
+/**
+ * Alphanumeric mode: 0 to 9, A to Z, space, $ % * + - . / :
+ */
+class AlphaNum extends QRDataAbstract{
+
+	/**
+	 * @inheritdoc
+	 */
+	protected $datamode = QRCode::DATA_ALPHANUM;
+
+	/**
+	 * @inheritdoc
+	 */
+	protected $lengthBits = [9, 11, 13];
+
+	/**
+	 * @inheritdoc
+	 */
+	protected function write(string $data):void{
+
+		for($i = 0; $i + 1 < $this->strlen; $i += 2){
+			$this->bitBuffer->put($this->getCharCode($data[$i]) * 45 + $this->getCharCode($data[$i + 1]), 11);
+		}
+
+		if($i < $this->strlen){
+			$this->bitBuffer->put($this->getCharCode($data[$i]), 6);
+		}
+
+	}
+
+	/**
+	 * @param string $chr
+	 *
+	 * @return int
+	 * @throws \chillerlan\QRCode\Data\QRCodeDataException
+	 */
+	protected function getCharCode(string $chr):int{
+		$i = array_search($chr, $this::ALPHANUM_CHAR_MAP);
+
+		if($i !== false){
+			return $i;
+		}
+
+		throw new QRCodeDataException(sprintf('illegal char: "%s" [%d]', $chr, ord($chr)));
+	}
+
+}