[ADD] web_list_record_popup: new module

[rvalyi]

Extracted from what we used in the Brazilian localization in version 16.0

Recent Odoo versions allows quick edition of order lines with inline editable list.
But sometimes the user wants to read or edit more details on the lines through the Form popup. This modules allows the best of the two edition modes: you can still have quick edition via the inline list edition, but you now have a Javascript button you can click on to open the Form view popup using the view defined inline in the One2many field if any.

Features:

• Adds a popup button to editable lists in form views
• Opens records in a form dialog instead of inline editing
• Works with both existing and new (NewID) records
• Optional activation via mixin - no hard dependencies

Usage:

Inherit from web_list_record_popup.mixin in your model and define
_popup_button_xpaths:

class MyModel(models.Model):
    _inherit = ["web_list_record_popup.mixin"]

    _popup_button_xpaths = [
        ("//field[@name='line_ids']/list/field[@name='product_id']", "before"),
    ]

The button will only appear if the web_list_record_popup module is
installed.

I'm not sure why we cannot run the Hoot tests on Runboat, but here is a print of them passing locally: