[IMP] web_editor, mass_mailing, website: restore the 12.0 editor

This PR reverts the saas-12.2 editor by restoring the 12.0 editor.

The saas-12.2 editor was an intermediate work between the previous
editor of Odoo 12 and the new one slated for Odoo 13. It was unstable
but it was expected to be replaced by the new editor of version 13.

However, since the new editor has been postponed to Odoo 14, the
saas-12.2 one would have been staying in Odoo 13, which would have
been a nightmare to maintain. To avoid this outcome, we chose to
put back the 12.0 editor in its place.

This has the particular advantage that Odoo 13 will share the same
bugfixes as Odoo 12 and 11 as they all run under the same core
editor, while the saas-12.2 one would have been an entirely
different beast to maintain.

Despite its title, this PR is not a revert of PR 29775 per se, as
we are using the wysiwyg abstraction layer that was introduced in
that PR.

The goal of the wysiwyg abstraction layer is to provide an
interface for other modules that want to use the editor feature
such that the editor core itself can be changed without requiring
extensive changes in the other modules.

This PR uses the wysiwyg abstraction layer to restore the 12.0
editor with minimal changes to the modules that use the editor.

closes odoo/odoo#35677

Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

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