* 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/phpunit.xml

@@ -0,0 +1,23 @@
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+		 xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
+		 bootstrap="vendor/autoload.php"
+		 cacheResultFile=".build/phpunit.result.cache"
+		 colors="true"
+		 verbose="true"
+>
+	<filter>
+		<whitelist processUncoveredFilesFromWhitelist="true">
+			<directory suffix=".php">./src</directory>
+		</whitelist>
+	</filter>
+	<testsuites>
+		<testsuite name="php-qrcode test suite">
+			<directory suffix=".php">./tests/</directory>
+		</testsuite>
+	</testsuites>
+	<logging>
+		<log type="coverage-clover" target=".build/coverage/clover.xml"/>
+		<log type="coverage-xml" target=".build/coverage/coverage-xml"/>
+		<log type="junit" target=".build/logs/junit.xml"/>
+	</logging>
+</phpunit>