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-clear-all-cache.md

@@ -0,0 +1,37 @@
+clearAllCache()
+
+clears the entire template cache
+
+Description
+===========
+
+void
+
+clearAllCache
+
+int
+
+expire\_time
+
+As an optional parameter, you can supply a minimum age in seconds the
+cache files must be before they will get cleared.
+
+> **Note**
+>
+> Since Smarty version 3.1.14 it is possible to delete cache files by
+> their individual expiration time at creation by passing constant
+> SMARTY::CLEAR\_EXPIRED as `expire_time` parameter.
+
+
+    <?php
+    // clear the entire cache
+    $smarty->clearAllCache();
+
+    // clears all files over one hour old
+    $smarty->clearAllCache(3600);
+    ?>
+
+       
+
+See also [`clearCache()`](#api.clear.cache),
+[`isCached()`](#api.is.cached) and the [caching](#caching) page.