[MERGE] tools, mail: ease bounce email content update based on alias security

PURPOSE

When incoming emails bounce due to alias security bounce email is quite
generic. Purpose of this task is to ease its customization and update.

SPECIFICATIONS

In order to improve the flexibility of alias, add a customizable html field
on the alias model. This html content will be send as bounce email core content
in case of bounced/unauthorized mail received for this alias,

Obviously it has no effect on 'everyone' security setting as no email will
bounce due to that issue.

If it is not set a default generic mail will be send depending on security
setting. It allows to keep void html fields when no specific bounce content
is required

In HR, an old template allowing some light customization for employee based
security option is removed as it is completely replaced by the new feature.

Also add references message-id of the mail received to the answer so that
threads are correctly set.

LINKS

Task ID 2126509
Community PR odoo/odoo#41827
Upgrade PR odoo/upgrade#936

Related: odoo/upgrade#936
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

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