customize_template_get which gets template inheritence informations was
not taken into account by website version, so at one time we could get
an erroneous view version instead of the wanted one.
This commit refactor some of the code adding a function to sort view and
find the most suitable one (based on website and version in request).
This function is then used in ir.ui.view `_view_obj`'s function to
select the correct view.
related to opw-667225
Nicolas Lempereur
b0b6b9afb5