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/mime/Header/HeaderInterface.php

@@ -1,72 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Mime\Header;
-
-/**
- * A MIME Header.
- *
- * @author Chris Corbyn
- */
-interface HeaderInterface
-{
-    /**
-     * Sets the body.
-     *
-     * The type depends on the Header concrete class.
-     *
-     * @return void
-     */
-    public function setBody(mixed $body);
-
-    /**
-     * Gets the body.
-     *
-     * The return type depends on the Header concrete class.
-     */
-    public function getBody(): mixed;
-
-    /**
-     * @return void
-     */
-    public function setCharset(string $charset);
-
-    public function getCharset(): ?string;
-
-    /**
-     * @return void
-     */
-    public function setLanguage(string $lang);
-
-    public function getLanguage(): ?string;
-
-    public function getName(): string;
-
-    /**
-     * @return void
-     */
-    public function setMaxLineLength(int $lineLength);
-
-    public function getMaxLineLength(): int;
-
-    /**
-     * Gets this Header rendered as a compliant string.
-     */
-    public function toString(): string;
-
-    /**
-     * Gets the header's body, prepared for folding into a final header value.
-     *
-     * This is not necessarily RFC 2822 compliant since folding white space is
-     * not added at this stage (see {@link toString()} for that).
-     */
-    public function getBodyAsString(): string;
-}