[16.0][ADD] self-service weighing station modules

[huguesdk]

add a collection of modules to configure a pos as a self-service weighing station:

• base_pos_self_service_weighing: base module providing the ui and the common functionalities; not useful on its own
• pos_self_service_weighing_product: allows customers to weigh products and print labels with a barcode identifying the product and containing its weight or its price
• pos_self_service_weighing_tare: allows customers to weigh containers and print labels with a barcode containing the weight of the container (tare weight) (labels usable with the pos_tare module)
• pos_self_service_weighing_product_tare: glue module between pos_self_service_weighing_product and pos_tare, allowing customers to take the weight of containers into account to compute the net weight when weighing products
• pos_self_service_weighing_print_zpl: allows to print barcode labels using zpl-compatible printers

this pull request depends on #1323.

[legalsylvain]

base_pos_self_service_weighing could be named simply pos_self_service_weighing

[huguesdk]

@legalsylvain i’ve followed the second item in the modules section of the oca guidelines. did these change?

[legalsylvain]

@legalsylvain i’ve followed the second item in the modules section of the oca guidelines. did these change?

Hi. I didn't Know that rule. I dont like it cause that prefix breaks the order.

But well.

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[mihien]

LGTM. Only thing I would change is the welcome screen, I think it would benefit from making it more obvious that it is a welcome screen. Just to make sure that a customer seeing it for the first time would know what he's seeing and what he needs to do, since it's self-service. Changing the button text closer to something like "Press here to start weighing products" would already be enough, or adding a welcome message above the button.