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-counter.md

@@ -0,0 +1,45 @@
+# {counter}
+
+`{counter}` is used to print out a count. `{counter}` will remember the
+count on each iteration. You can adjust the number, the interval and the
+direction of the count, as well as determine whether to print the
+value. You can run multiple counters concurrently by supplying a unique
+name for each one. If you do not supply a name, the name "default" will
+be used.
+
+## Attributes
+
+| Attribute Name | Required | Description                                               |
+|----------------|----------|-----------------------------------------------------------|
+| name           | No       | The name of the counter                                   |
+| start          | No       | The initial number to start counting from (defaults to 1) |
+| skip           | No       | The interval to count by (defaults to 1)                  |
+| direction      | No       | The direction to count (up/down) (defaults to 'up')       |
+| print          | No       | Whether or not to print the value (defaults to true)      |
+| assign         | No       | the template variable the output will be assigned to      |
+
+If you supply the `assign` attribute, the output of the `{counter}`
+function will be assigned to this template variable instead of being
+output to the template.
+
+## Examples
+
+```smarty
+
+{* initialize the count *}
+{counter start=0 skip=2}<br />
+{counter}<br />
+{counter}<br />
+{counter}<br />
+
+```
+
+this will output:
+
+```html
+0<br />
+2<br />
+4<br />
+6<br />
+```
+