[ADD] portal: add module for customer portal and sharing features

This module adds required base code for a fully integrated customer
portal. It contains the base controller class and base templates.
Business addons will add their specific templates and controllers
to extend the customer portal.

This module contains most code coming from odoo v10 website_portal.
Purpose of this module is to allow the display of a customer portal
without having a dependency towards website edition and customization
capabilities.

Some CSS files used in frontend assets are already moved to have a
working portal skeleton. A is_public method on users is also added
as it will be used in various portal code soon.

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