[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/UTF8UtilsTest.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Masterminds\HTML5\Tests\Parser;
+
+use Masterminds\HTML5\Parser\UTF8Utils;
+
+class UTF8UtilsTest extends \Masterminds\HTML5\Tests\TestCase
+{
+    public function testConvertToUTF8()
+    {
+        $out = UTF8Utils::convertToUTF8('éàa', 'ISO-8859-1');
+        $this->assertEquals('éàa', $out);
+    }
+
+    /**
+     * @todo add tests for invalid codepoints
+     */
+    public function testCheckForIllegalCodepoints()
+    {
+        $smoke = 'Smoke test';
+        $err = UTF8Utils::checkForIllegalCodepoints($smoke);
+        $this->assertEmpty($err);
+
+        $data = "Foo Bar \0 Baz";
+        $errors = UTF8Utils::checkForIllegalCodepoints($data);
+        $this->assertContains('null-character', $errors);
+    }
+}