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-get-template-vars.md

@@ -0,0 +1,37 @@
+getTemplateVars()
+
+returns assigned variable value(s)
+
+Description
+===========
+
+array
+
+getTemplateVars
+
+string
+
+varname
+
+If no parameter is given, an array of all [assigned](#api.assign)
+variables are returned.
+
+
+    <?php
+    // get assigned template var 'foo'
+    $myVar = $smarty->getTemplateVars('foo');
+
+    // get all assigned template vars
+    $all_tpl_vars = $smarty->getTemplateVars();
+
+    // take a look at them
+    print_r($all_tpl_vars);
+    ?>
+
+       
+
+See also [`assign()`](#api.assign),
+[`{assign}`](#language.function.assign), [`append()`](#api.append),
+[`clearAssign()`](#api.clear.assign),
+[`clearAllAssign()`](#api.clear.all.assign) and
+[`getConfigVars()`](#api.get.config.vars)