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-custom-functions/language-function-fetch.md

@@ -0,0 +1,61 @@
+# {fetch}
+
+`{fetch}` is used to retrieve files from the local file system, http, or
+ftp and display the contents.
+
+## Attributes
+| Attribute | Required | Description                                          |
+|-----------|----------|------------------------------------------------------|
+| file      | Yes      | The file, http or ftp site to fetch                  |
+| assign    | No       | The template variable the output will be assigned to |
+
+-   If the file name begins with `http://`, the website page will be
+    fetched and displayed.
+
+    > **Note**
+    >
+    > This will not support http redirects, be sure to include a
+    > trailing slash on your web page fetches where necessary.
+
+-   If the file name begins with `ftp://`, the file will be downloaded
+    from the ftp server and displayed.
+
+-   For local files, either a full system file path must be given, or a
+    path relative to the executed php script.
+
+    > **Note**
+    >
+    > If security is enabled, and you are fetching a file from the local
+    > file system, `{fetch}` will only allow files from within the
+    > `$secure_dir` path of the security policy. See the
+    > [Security](../../programmers/advanced-features/advanced-features-security.md) section for details.
+
+-   If the `assign` attribute is set, the output of the `{fetch}`
+    function will be assigned to this template variable instead of being
+    output to the template.
+
+## Examples
+
+```smarty
+{* include some javascript in your template *}
+{fetch file='/export/httpd/www.example.com/docs/navbar.js'}
+
+{* embed some weather text in your template from another web site *}
+{fetch file='http://www.myweather.com/68502/'}
+
+{* fetch a news headline file via ftp *}
+{fetch file='ftp://user:password@ftp.example.com/path/to/currentheadlines.txt'}
+{* as above but with variables *}
+{fetch file="ftp://`$user`:`$password`@`$server`/`$path`"}
+
+{* assign the fetched contents to a template variable *}
+{fetch file='http://www.myweather.com/68502/' assign='weather'}
+{if $weather ne ''}
+  <div id="weather">{$weather}</div>
+{/if}
+```
+      
+
+See also [`{capture}`](../language-builtin-functions/language-function-capture.md),
+[`{eval}`](language-function-eval.md),
+[`{assign}`](../language-builtin-functions/language-function-assign.md) and [`fetch()`](../../programmers/api-functions/api-fetch.md).