Migrate to php-cs-fixer

Author: AydinHassan

.gitignore

@@ -3,3 +3,5 @@
 program.php
 .phpunit.result.cache
 /build
+/vendor-bin/**/vendor/
+.php-cs-fixer.cache

.php-cs-fixer.php

@@ -0,0 +1,13 @@
+<?php
+
+$finder = (new PhpCsFixer\Finder())
+    ->in(__DIR__)
+    ->exclude('test/res')
+;
+
+return (new PhpCsFixer\Config())
+    ->setRules([
+        '@PER-CS2.0' => true,
+        'no_unused_imports' => true,
+    ])
+    ->setFinder($finder);