[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/InstructionProcessorMock.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Masterminds\HTML5\Tests\Parser;
+
+class InstructionProcessorMock implements \Masterminds\HTML5\InstructionProcessor
+{
+    public $name = null;
+
+    public $data = null;
+
+    public $count = 0;
+
+    public function process(\DOMElement $element, $name, $data)
+    {
+        $this->name = $name;
+        $this->data = $data;
+        ++$this->count;
+
+        $div = $element->ownerDocument->createElement('div');
+        $div->nodeValue = 'foo';
+
+        $element->appendChild($div);
+
+        return $div;
+    }
+}