[MERGE] mail, sms: move rendering tool on mail.render.mixin

PURPOSE

Merge rendering tools used in mail and sms templates and move them
directly in mail.render.mixin

SPECIFICATIONS

Clean rendering methods API and calls. Ensure they are private. Improve
naming and docstrings to ease understanding.

Move rendering methods on mail.render.mixin. It makes no senss to have to
create a void mail.template recordset just to invoke jinjna rendering engine.
Now rendering will be available

  * either directly through inherit;
  * either by calling env['mail.render.mixin']._render_template();

Move local to global links convertion as well as links shortening tool methods
on mail.render.mixin . That way this mixin holds tools related to rendering
and its post-processing.

This impacts mail.template, sms.template and mailing.mailing as side effect
without any functional change.

LINKS

Task ID 1963529
Community PR odoo/odoo#32397
Enterprise PR odoo/enterprise#8634
Upgrade PR odoo/upgrade#911

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

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