Add Composer autoloading functions and PHPStan for testing

vendor/nette/php-generator/src/PhpGenerator/PsrPrinter.php

@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * This file is part of the Nette Framework (https://nette.org)
+ * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
+ */
+
+declare(strict_types=1);
+
+namespace Nette\PhpGenerator;
+
+
+/**
+ * Generates PHP code compatible with PSR-2 and PSR-12.
+ */
+final class PsrPrinter extends Printer
+{
+	/** @var string */
+	protected $indentation = '    ';
+
+	/** @var int */
+	protected $linesBetweenMethods = 1;
+}