TEMP : try to check if the index.php can read Gateways, use new $gateway

Source/API/script/index.php

@@ -40,7 +40,7 @@ $app->get('/', function (Request $request, Response $response) {
     $listGateway = array("\\Gateway\\GatewayForm", "\\Gateway\\GatewayKeyword", "\\Gateway\\GatewayQuestion");
     $ok = false;
     foreach ($listGateway as $gateway){
-        echo implode(",",get_class_methods($gateway));
+        echo implode(",",get_class_methods((new $gateway)));
         if (method_exists($gateway, $method)) {
             $ok = true;
             $response->getBody()->write(json_encode((new $gateway)->$method($parameters)));