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-variables/variable-debugging.md

@@ -0,0 +1,17 @@
+\$debugging {#variable.debugging}
+===========
+
+This enables the [debugging console](#chapter.debugging.console). The
+console is a javascript popup window that informs you of the
+[included](#language.function.include) templates, variables
+[assigned](#api.assign) from php and [config file
+variables](#language.config.variables) for the current script. It does
+not show variables assigned within a template with the
+[`{assign}`](#language.function.assign) function.
+
+The console can also be enabled from the url with
+[`$debugging_ctrl`](#variable.debugging.ctrl).
+
+See also [`{debug}`](#language.function.debug),
+[`$debug_tpl`](#variable.debug_template), and
+[`$debugging_ctrl`](#variable.debugging.ctrl).