*: theme_default
Since [1] when installing a theme from the Website builder's Themes tab,
if that theme used other snippets than the default ones in their
configurator pages which were inherited, the import of the theme failed
because the primary template was not generated before the import of the
data files.
This commit relies on each theme calling
`_generate_primary_snippet_templates` before declaring templates that
require them.
In master, the early loading is removed altogether.
See the changes in `theme_default` for the approach that was adopted
through all themes.
Steps to reproduce in master:
- Start odoo-bin with `-i website`.
- Edit home page.
- Go to the "Theme" tab.
- Click on "Switch Theme".
- Pick "CORPORATE / Buzzy".
=> Fails because the `website.configurator_s_banner` template is not
defined.
[1]: https://github.com/odoo/odoo/commit/cfed4e391d11058b1b46417f0b630cdbc4070d7c
task-3670496
closesodoo/odoo#148443
Related: odoo/design-themes#755
Signed-off-by: Romain Derie (rde) <rde@odoo.com>