Since saas-3, website controllers use `request.website.render`
to render the template of a web page. This was kept for retro
compatibility. It's time to stop using deprecated stuff.
Same for `_render` method on website.
'json' route don't use `request.render` since
`JsonRequest` has no `render` method.
Also added basic controllers on the partner model, allowing to see the public
page of a published partner (or all partners if website manager). The template
was already existing, but the controller was missing. It has been added.
[FIX] website_customer: fix the inheritance of view as the website group has been
removed in the parent view. Also added a breadcrumb fix.
Jérome Maes