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/advanced-features/advanced-features-template-settings.md

@@ -0,0 +1,32 @@
+Changing settings by template {#advanced.features.template.settings}
+=============================
+
+Normally you configure the Smarty settings by modifying the
+[`Smarty class variables`](#api.variables). Furthermore you can register
+plugins, filters etc. with [`Smarty functions`](#api.functions).
+Modifications done to the Smarty object will be global for all
+templates.
+
+However the Smarty class variables and functions can be accessed or
+called by individual template objects. Modification done to a template
+object will apply only for that template and its included subtemplates.
+
+
+    <?php
+    $tpl = $smarty->createTemplate('index.tpl);
+    $tpl->cache_lifetime = 600;
+    //or
+    $tpl->setCacheLifetime(600);
+    $smarty->display($tpl);
+    ?>
+
+        
+
+
+    <?php
+    $tpl = $smarty->createTemplate('index.tpl);
+    $tpl->registerPlugin('modifier','mymodifier');
+    $smarty->display($tpl);
+    ?>
+
+