[feature/controller] Implement a front controller

PHPBB3-10864

tests/controller/ext/foo/config/routing.yml

@@ -0,0 +1,3 @@
+controller1:
+    pattern: /foo
+    defaults: { _controller: foo.controller:handle }

tests/controller/ext/foo/config/services.yml

@@ -0,0 +1,3 @@
+services:
+    foo.controller:
+        class: phpbb_ext_foo_controller

tests/controller/ext/foo/controller.php

@@ -0,0 +1,23 @@
+<?php
+
+use Symfony\Component\HttpFoundation\Response;
+
+class phpbb_ext_foo_controller
+{
+	/**
+	* Constructor
+	*/
+	public function __construct()
+	{
+	}
+
+	/**
+	* Handle method
+	*
+	* @return null
+	*/
+	public function handle()
+	{
+		return new Response('Test', 200);
+	}
+}