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/plugins/plugins-inserts.md

@@ -0,0 +1,48 @@
+Inserts {#plugins.inserts}
+=======
+
+Insert plugins are used to implement functions that are invoked by
+[`{insert}`](#language.function.insert) tags in the template.
+
+string
+
+smarty\_insert\_
+
+name
+
+array
+
+\$params
+
+object
+
+\$template
+
+The first parameter to the function is an associative array of
+attributes passed to the insert.
+
+The insert function is supposed to return the result which will be
+substituted in place of the `{insert}` tag in the template.
+
+
+    <?php
+    /*
+     * Smarty plugin
+     * -------------------------------------------------------------
+     * File:     insert.time.php
+     * Type:     time
+     * Name:     time
+     * Purpose:  Inserts current date/time according to format
+     * -------------------------------------------------------------
+     */
+    function smarty_insert_time($params, Smarty_Internal_Template $template)
+    {
+        if (empty($params['format'])) {
+            trigger_error("insert time: missing 'format' parameter");
+            return;
+        }
+        return strftime($params['format']);
+    }
+    ?>
+
+