16.0 add pos_restaurant_receipt_usability

[legalsylvain]

depends on #1210

This module extends the functionality of Point of Sale Restaurant module,
improving the display of the receipt screen, in a "Split receipt" use case.

By default, at the end of a split-ticket cashing, on the receipt page,
the user only has the option of clicking on "Next order",
which creates a new blank order.

In this use case, it is preferable to return to the screen which allows
to continue "splitting" the same ticket, until all the order is paid.

Without the module

With the module