odoo/upgrade-util#447

Created by Website, Robin Lejeune (role)
Merged at d73fcf1cc9325025173cee3e402c2baf9ae539ab

Statuses:

label
odoo-dev:master-fieldscope-role
head
7ed0fa437312f6a23ae4da4ba8fff7378e6b8146
merged
1 day ago by Upgrade, Christophe Simonis (chs)
odoo/upgrade-util
master #447

[IMP] util.snippets: add FieldScope.WEBSITE

FieldScope (introduced with 1) only gave the option to target all
fields (FieldScope.ALL), or those depending on html_builder
(FieldScope.SNIPPETS).
This is not sufficient when we want to target website without targeting
mass_mailing, which is why this commit adds a FieldScope.WEBSITE.