Add Composer autoloading functions and PHPStan for testing

vendor/nikic/php-parser/lib/PhpParser/Node/Stmt/Nop.php

@@ -0,0 +1,17 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser\Node\Stmt;
+
+use PhpParser\Node;
+
+/** Nop/empty statement (;). */
+class Nop extends Node\Stmt
+{
+    public function getSubNodeNames() : array {
+        return [];
+    }
+    
+    public function getType() : string {
+        return 'Stmt_Nop';
+    }
+}