Purpose is to prepare future improvements in mail and SMS module. In this
commit we apply some guidelines on XML Ids and file naming.
In mail cancel wizard code is separated from the resend one as they have
nothing in common.
More importantly ``sms.send_sms`` model is renamed to ``sms.composer`` to
avoid underscores (which is really really bad, take a look at
ir.config_parameter) and have a meaningful name.
Related to task 1922163
Linked to PR #34516
Co-Authored-By: Thibault Delavallee <tde@odoo.com>
Co-Authored-By: Pierre Rousseau <pro@odoo.com>
Julien Castiaux