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/SECURITY.md

@@ -2,18 +2,19 @@
 
 ## Supported Versions
 
-Smarty currently supports the latest minor version of Smarty 3 and Smarty 4. (Smarty 4 has not been released yet.)
+Smarty currently supports the latest minor version of Smarty 3 and Smarty 4.
 
 | Version | Supported          |
-| ------- | ------------------ |
-| 4.0.x   | :white_check_mark: |
+|---------|--------------------|
+| 4.3.x   | :white_check_mark: |
 | 3.1.x   | :white_check_mark: |
 | < 3.1   | :x:                |
 
 ## Reporting a Vulnerability
 
- If you have discovered a security issue with Smarty, please contact us at mail [at] simonwisselink.nl. Do not 
- disclose your findings publicly and PLEASE PLEASE do not file an Issue.
+If you have discovered a security issue with Smarty, please contact us at mail [at] simonwisselink.nl. Do not 
+disclose your findings publicly and **PLEASE** do not file an Issue (because that would disclose your findings 
+publicly.)
  
 We will try to confirm the vulnerability and develop a fix if appropriate. When we release the fix, we will publish 
 a security release. Please let us know if you want to be credited.