Import latest app updates from streamline

An updated set of source files and initialization was provided by streamline to
address issues observed during initial testing. These files have been updated in
order to generate a new set of app images.

docker/streamline-src/vendor/symfony/http-kernel/HttpCache/ResponseCacheStrategyInterface.php

@@ -1,41 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * This code is partially based on the Rack-Cache library by Ryan Tomayko,
- * which is released under the MIT license.
- * (based on commit 02d2b48d75bcb63cf1c0c7149c077ad256542801)
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\HttpKernel\HttpCache;
-
-use Symfony\Component\HttpFoundation\Response;
-
-/**
- * ResponseCacheStrategyInterface implementations know how to compute the
- * Response cache HTTP header based on the different response cache headers.
- *
- * @author Fabien Potencier <fabien@symfony.com>
- */
-interface ResponseCacheStrategyInterface
-{
-    /**
-     * Adds a Response.
-     *
-     * @return void
-     */
-    public function add(Response $response);
-
-    /**
-     * Updates the Response HTTP headers based on the embedded Responses.
-     *
-     * @return void
-     */
-    public function update(Response $response);
-}