* 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/Number.php

@@ -0,0 +1,82 @@
+<?php
+/**
+ * Class Number
+ *
+ * @filesource   Number.php
+ * @created      26.11.2015
+ * @package      QRCode
+ * @author       Smiley <smiley@chillerlan.net>
+ * @copyright    2015 Smiley
+ * @license      MIT
+ */
+
+namespace chillerlan\QRCode\Data;
+
+use chillerlan\QRCode\QRCode;
+
+use function ord, sprintf, substr;
+
+/**
+ * Numeric mode: decimal digits 0 through 9
+ */
+class Number extends QRDataAbstract{
+
+	/**
+	 * @inheritdoc
+	 */
+	protected $datamode = QRCode::DATA_NUMBER;
+
+	/**
+	 * @inheritdoc
+	 */
+	protected $lengthBits = [10, 12, 14];
+
+	/**
+	 * @inheritdoc
+	 */
+	protected function write(string $data):void{
+		$i = 0;
+
+		while($i + 2 < $this->strlen){
+			$this->bitBuffer->put($this->parseInt(substr($data, $i, 3)), 10);
+			$i += 3;
+		}
+
+		if($i < $this->strlen){
+
+			if($this->strlen - $i === 1){
+				$this->bitBuffer->put($this->parseInt(substr($data, $i, $i + 1)), 4);
+			}
+			elseif($this->strlen - $i === 2){
+				$this->bitBuffer->put($this->parseInt(substr($data, $i, $i + 2)), 7);
+			}
+
+		}
+
+	}
+
+	/**
+	 * @param string $string
+	 *
+	 * @return int
+	 * @throws \chillerlan\QRCode\Data\QRCodeDataException
+	 */
+	protected function parseInt(string $string):int{
+		$num = 0;
+
+		$len = strlen($string);
+		for($i = 0; $i < $len; $i++){
+			$c = ord($string[$i]);
+
+			if(!in_array($string[$i], $this::NUMBER_CHAR_MAP, true)){
+				throw new QRCodeDataException(sprintf('illegal char: "%s" [%d]', $string[$i], $c));
+			}
+
+			$c   = $c - 48; // ord('0')
+			$num = $num * 10 + $c;
+		}
+
+		return $num;
+	}
+
+}