[CORE][COMPOSER] Move extlib packages with immediate composer correspondent to composer dependencies

This adds a composer.json for all dependencies that are available

vendor/masterminds/html5/test/HTML5/Parser/EventStackError.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Masterminds\HTML5\Tests\Parser;
+
+class EventStackError extends \Exception
+{
+}