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/sebastian/diff/src/Line.php

@@ -1,66 +0,0 @@
-<?php declare(strict_types=1);
-/*
- * This file is part of sebastian/diff.
- *
- * (c) Sebastian Bergmann <sebastian@phpunit.de>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-namespace SebastianBergmann\Diff;
-
-final class Line
-{
-    public const ADDED     = 1;
-    public const REMOVED   = 2;
-    public const UNCHANGED = 3;
-    private int $type;
-    private string $content;
-
-    public function __construct(int $type = self::UNCHANGED, string $content = '')
-    {
-        $this->type    = $type;
-        $this->content = $content;
-    }
-
-    public function content(): string
-    {
-        return $this->content;
-    }
-
-    public function type(): int
-    {
-        return $this->type;
-    }
-
-    public function isAdded(): bool
-    {
-        return $this->type === self::ADDED;
-    }
-
-    public function isRemoved(): bool
-    {
-        return $this->type === self::REMOVED;
-    }
-
-    public function isUnchanged(): bool
-    {
-        return $this->type === self::UNCHANGED;
-    }
-
-    /**
-     * @deprecated
-     */
-    public function getContent(): string
-    {
-        return $this->content;
-    }
-
-    /**
-     * @deprecated
-     */
-    public function getType(): int
-    {
-        return $this->type;
-    }
-}