Several changes have been made, primarily around checking the existence of methods and classes and
removing unnecessary comments.

- Method checks have been introduced to ensure the `getCachePath()` method exists before calling it.
- Removed invalid phpDocs, e.g., @var $Site Site and @var $Project Project
- Fixed typing to align return types and updated a factory method to check class existence.
- Added variable definition comments in the settings.css.php file for clarity.

Related: #114

feat: Currency Switch use the reworked version of package/quiqqer/currency/bin/controls/Switch #86

feat: Set correct images if product ist a variant product.

#67

#15

#15

feat: HTML structure redesigned.

#48

refactor: workaround damit mir das ding nicht um die ohren fliegt. (bleibt so bis michael das ganze behoben hat)

feat: Login and register site type works.

feat: Currency Lang Switch reworked. Do not show arrow if there are nothing to switch (neither language nor currency)

refactor: Many small changes.
fix: Search on product search site works.

feat: Clear filter button styled.

refactor: Class documentation changed.

feat: Payments control added.

feat: Many others shop category menu improvements.

feat: New template settings (show / hide shop categories menu).