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-create-data.md

@@ -0,0 +1,52 @@
+createData()
+
+creates a data object
+
+Description
+===========
+
+string
+
+createData
+
+object
+
+parent
+
+string
+
+createData
+
+This creates a data object which will hold assigned variables. It uses
+the following parameters:
+
+-   `parent` is an optional parameter. It is an uplink to the main
+    Smarty object, a another user-created data object or to user-created
+    template object. These objects can be chained. Templates can access
+    variables assigned to any of the objects in it\'s parent chain.
+
+Data objects are used to create scopes for assigned variables. They can
+be used to control which variables are seen by which templates.
+
+
+    <?php
+    include('Smarty.class.php');
+    $smarty = new Smarty;
+
+    // create data object with its private variable scope
+    $data = $smarty->createData();
+
+    // assign variable to data scope
+    $data->assign('foo','bar');
+
+    // create template object which will use variables from data object
+    $tpl = $smarty->createTemplate('index.tpl',$data);
+
+    // display the template
+    $tpl->display();
+    ?>
+
+        
+
+See also [`display()`](#api.display), and
+[`createTemplate()`](#api.create.template),