A fix has been applied in the src/QUI/TemplateCologne/Utils.php file. A condition has been added to
check whether the PRODUCT_FIELD_SHIPPING_TIME constant is defined. If not, the function will return
false to prevent any potential errors.

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

Related: #116

Related: #111

Add QUIQQER Tooling

See merge request !15

(cherry picked from commit 7337c621)

Co-authored-by: Michael Danielczok <michael@pcsg.de>

(cherry picked from commit 09046aec)

Co-authored-by: Michael Danielczok <michael@pcsg.de>

Related: brassberg/tickets#244


(cherry picked from commit 28cc1658)

Co-authored-by: Michael Danielczok <michael@pcsg.de>

fix: quiqqer/quiqqer locale and paths adapted to quiqqer/core

See merge request !13

feat!: quiqqer v2

See merge request !11

feat!: quiqqer v2

See merge request !10

BREAKING CHANGE: quiqqer v2 has been renamed to quiqqer/core. a new major version will be created here so that we can still develop for both versions.