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-get-template-dir.md

@@ -0,0 +1,40 @@
+getTemplateDir()
+
+return the directory where templates are stored
+
+Description
+===========
+
+string\|array
+
+getTemplateDir
+
+string
+
+key
+
+
+    <?php
+
+    // set some template directories
+    $smarty->setTemplateDir(array(
+        'one' => './templates',
+        'two' => './templates_2',
+        'three' => './templates_3',
+    ));
+
+    // get all directories where templates are stored
+    $template_dir = $smarty->getTemplateDir();
+    var_dump($template_dir); // array
+
+    // get directory identified by key
+    $template_dir = $smarty->getTemplateDir('one');
+    var_dump($template_dir); // string
+
+    ?>
+
+       
+
+See also [`setTemplateDir()`](#api.set.template.dir),
+[`addTemplateDir()`](#api.add.template.dir) and
+[`$template_dir`](#variable.template.dir).