Dev-Umgebung: Kompatibilität für PHP 8.3 + Smarty 4.5.6

- Smarty 4.1.1 → 4.5.6 (behebt dynamic property deprecations)
- Core-Klassen: #[\AllowDynamicProperties] für Admin_role, base, Config,
  Customer, Customer_group, CustomerGroups, Item, Structure, website
- website.class.php: counts[parent_id] initialisieren vor ++ (PHP 8.1)
- layout.class.php: HTTP_ACCEPT_LANGUAGE mit isset-Guard
- website_init.php: session_status()-Check vor session_start
- .htaccess: HTTPS-Redirect via X-Forwarded-Proto (statt SERVER_PORT)
- themes/easyshop_advanced/media/: Parent-Theme-Assets nachgezogen
- .gitignore: smarty.4.1.1.bak ausschließen

libs/smarty/docs/programmers/api-functions/api-set-config-dir.md

@@ -0,0 +1,47 @@
+setConfigDir()
+
+set the directories where config files are stored
+
+Description
+===========
+
+Smarty
+
+setConfigDir
+
+string\|array
+
+config\_dir
+
+
+    <?php
+
+    // set a single directory where the config files are stored
+    $smarty->setConfigDir('./config');
+
+    // view the config dir chain
+    var_dump($smarty->getConfigDir());
+
+    // set multiple directoríes where config files are stored
+    $smarty->setConfigDir(array(
+        'one' => './config',
+        'two' => './config_2',
+        'three' => './config_3',
+    ));
+
+    // view the config dir chain
+    var_dump($smarty->getConfigDir());
+
+    // chaining of method calls
+    $smarty->setTemplateDir('./templates')
+           ->setConfigDir('./config')
+           ->setCompileDir('./templates_c')
+           ->setCacheDir('./cache');
+
+    ?>
+
+       
+
+See also [`getConfigDir()`](#api.get.config.dir),
+[`addConfigDir()`](#api.add.config.dir) and
+[`$config_dir`](#variable.config.dir).