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-enable-security.md

@@ -0,0 +1,41 @@
+enableSecurity()
+
+enables template security
+
+Description
+===========
+
+string
+
+enableSecurity
+
+string
+
+securityclass
+
+string
+
+enableSecurity
+
+object
+
+securityobject
+
+string
+
+enableSecurity
+
+This enables security checking on templates. It uses the following
+parameters:
+
+-   `securityclass` is an optional parameter. It\'s the name of the
+    class with defines the security policy parameters.
+
+-   `securityobject` is an optional parameter. It\'s the object with
+    defines the security policy parameters.
+
+For the details how to setup a security policy see the
+[Security](#advanced.features.security) section.
+
+See also [`disableSecurity()`](#api.disable.security), and
+[Security](#advanced.features.security).