CMS 2.0 - Theme engine, logging, admin improvements

Major changes:
- New ThemeManager with Twig templating and SCSS compilation
- Dynamic themes system (themes/default, themes/demo)
- LogManager with SQLite storage and syslog forwarding
- RequestLogger with static helper methods
- Admin UI overhaul (Bootstrap 5, dark mode)
- Admin config page with logging and theme settings
- Admin logs page with filters and search
- Removed legacy Mustache templates
- Removed test plugin and theme
- Composer dependencies: Twig, scssphp, CommonMark, MaxMind GeoIP

vendor/symfony/filesystem/Exception/IOExceptionInterface.php

@@ -0,0 +1,25 @@
+<?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\Filesystem\Exception;
+
+/**
+ * IOException interface for file and input/output stream related exceptions thrown by the component.
+ *
+ * @author Christian Gärtner <christiangaertner.film@googlemail.com>
+ */
+interface IOExceptionInterface extends ExceptionInterface
+{
+    /**
+     * Returns the associated path for the exception.
+     */
+    public function getPath(): ?string;
+}