fix: update formatting and DOM manipulation in SimpleCheckout.js

See merge request !53

This commit implements minor refactoring changes in the SimpleCheckout.js file.
- Updated formatting to include space before function parameters across multiple method
declarations for improved readability.
- Modified DOM manipulation logic to use data-name attribute instead of class name for element
selection, enhancing selection accuracy.
- Added data-name attribute set command to retain DOM element specific data when replacing HTML.
- Improvements in 'require' callbacks to use fat arrow function notation.
- Minor adjustments in formatting in methods dealing with Events and DOM manipulations.

Related: coupons#19

fix: hide checkout details and payment container during processing

See merge request !51

In `SimpleCheckout.js`, an animation has been added to enhance the user experience while scrolling
to the payment container. On the other hand, in `Checkout.html`, the
`quiqqer-simple-checkout__scrollToPaymentContainer` class has been updated to initially set the
opacity to 0 to make the animation smoother.

This commit hides the elements '.quiqqer-simple-checkout-orderDetails' and
'.quiqqer-simple-checkout__scrollToPaymentContainer' in 'SimpleCheckout.js' during processing. When
the element with '.quiqqer-order-step-processing' class is present, the mentioned elements are set
to 'display: none', preventing them from being viewed during order processing. The same logic
applies when the order is successful, ensuring a cleaner interface during these steps.

Related: #22

fix: mobile sum display error

See merge request !50

Related: pcsg/kunden/libellio/b2c/core#30

fix: refresh mobile basket

See merge request !49

fix: check empty delivery address

See merge request !48

fix: script init at last step

See merge request !47

fix: consider no display price

See merge request !46

Next 2.x

See merge request !45

fix: missing events and text article are considered

See merge request !44

Related: #21

Related: #21

Related: #12

Only the address is then displayed. The address cannot be changed/edited by the user.

Coupons were incompatible with simple checkout. Since coupons insert text articles into the order.
However, text articles destroyed the basket.

Next 2.x

Closes #20

See merge request !43

fix: consider setting - failedPaymentProcedure

See merge request !42

fix: handle cases where project has no images by creating demo data for product page

See merge request !41