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-builtin-functions/language-function-strip.md

@@ -0,0 +1,45 @@
+# {strip}
+
+Many times web designers run into the issue where white space and
+carriage returns affect the output of the rendered HTML (browser
+"features"), so you must run all your tags together in the template to
+get the desired results. This usually ends up in unreadable or
+unmanageable templates.
+
+Anything within `{strip}{/strip}` tags are stripped of the extra spaces
+or carriage returns at the beginnings and ends of the lines before they
+are displayed. This way you can keep your templates readable, and not
+worry about extra white space causing problems.
+
+> **Note**
+>
+> `{strip}{/strip}` does not affect the contents of template variables,
+> see the [strip modifier](../language-modifiers/language-modifier-strip.md) instead.
+
+```smarty
+{* the following will be all run into one line upon output *}
+{strip}
+    <table>
+     <tr>
+      <td>
+       <a href="#">
+        This is a test
+       </a>
+      </td>
+     </tr>
+    </table>
+{/strip}
+```
+      
+The above example will output:
+
+```html
+<table><tr><td><a href="#">This is a test</a></td></tr></table>
+```
+
+Notice that in the above example, all the lines begin and end with HTML
+tags. Be aware that all the lines are run together. If you have plain
+text at the beginning or end of any line, they will be run together, and
+may not be desired results.
+
+See also the [`strip`](../language-modifiers/language-modifier-strip.md) modifier.