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/Encoder/QpContentEncoder.php

@@ -1,55 +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\Encoder;
-
-/**
- * @author Lars Strojny
- */
-final class QpContentEncoder implements ContentEncoderInterface
-{
-    public function encodeByteStream($stream, int $maxLineLength = 0): iterable
-    {
-        if (!\is_resource($stream)) {
-            throw new \TypeError(sprintf('Method "%s" takes a stream as a first argument.', __METHOD__));
-        }
-
-        // we don't use PHP stream filters here as the content should be small enough
-        yield $this->encodeString(stream_get_contents($stream), 'utf-8', 0, $maxLineLength);
-    }
-
-    public function getName(): string
-    {
-        return 'quoted-printable';
-    }
-
-    public function encodeString(string $string, ?string $charset = 'utf-8', int $firstLineOffset = 0, int $maxLineLength = 0): string
-    {
-        return $this->standardize(quoted_printable_encode($string));
-    }
-
-    /**
-     * Make sure CRLF is correct and HT/SPACE are in valid places.
-     */
-    private function standardize(string $string): string
-    {
-        // transform CR or LF to CRLF
-        $string = preg_replace('~=0D(?!=0A)|(?<!=0D)=0A~', '=0D=0A', $string);
-        // transform =0D=0A to CRLF
-        $string = str_replace(["\t=0D=0A", ' =0D=0A', '=0D=0A'], ["=09\r\n", "=20\r\n", "\r\n"], $string);
-
-        return match (\ord(substr($string, -1))) {
-            0x09 => substr_replace($string, '=09', -1),
-            0x20 => substr_replace($string, '=20', -1),
-            default => $string,
-        };
-    }
-}