Serialize filters

@todo use function "string create_function(string $args , string $code)"

string $code:
~~~
$route->filter(
	'if ($request->method() != Request::GET)'
	.'	return FALSE;'  // This route only matches GET requests
	.'if (isset($params["action"]) AND $params["action"] == "list")'
	.'	$params["action"] = "index";'
	.'return $params;'
);
~~~