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/designers/language-modifiers/language-modifier-strip.md

@@ -0,0 +1,42 @@
+# strip
+
+This replaces all spaces, newlines and tabs with a single space, or with
+the supplied string.
+
+## Basic usage
+```smarty
+{$myVar|strip}
+```
+
+> **Note**
+>
+> If you want to strip blocks of template text, use the built-in
+> [`{strip}`](../language-builtin-functions/language-function-strip.md) function.
+
+## Examples
+
+```php
+<?php
+$smarty->assign('articleTitle', "Grandmother of\neight makes\t    hole in one.");
+$smarty->display('index.tpl');
+```
+
+Where template is:
+
+```smarty
+{$articleTitle}
+{$articleTitle|strip}
+{$articleTitle|strip:'&nbsp;'}
+```
+
+Will output:
+
+```html
+Grandmother of
+eight makes        hole in one.
+Grandmother of eight makes hole in one.
+Grandmother&nbsp;of&nbsp;eight&nbsp;makes&nbsp;hole&nbsp;in&nbsp;one.
+```
+
+See also [`{strip}`](../language-builtin-functions/language-function-strip.md) and
+[`truncate`](language-modifier-truncate.md).