Purpose of this commit is to enhance quality of templates proposed by Odoo
and make them use notification layout when send by emails. Those emails
are cleaner and more up to date compared to other emails.
Including
* registration and reminder templates that are send directly by email
are improved to directly include the notification layout in the body
itself;
* improve layout of badge template;
* use notification layout when sending badge;
* improve layout of track confirmation template;
* use notification layout when sending templates based on stage change;
This commit is related to task ID 51122 (and PR #24052).
Purpose of this commit is to clean and ease the use of tracks in
event management.
* status is change to stages. Those are global for all event as we
consider track acceptation process as similar across events;
* change speakers many2many to a one2many. Most event have only one
speaker or at least a main speaker;
* add various chatter features: tracking of template, subtypes,
suggested recipients, ... Also add activities on tracks and their
various filters;
* add automatic mailing on stages like already done in tasks or
issues;
* tweak display of tracks on agenda. Event manager see unpublished
tracks with the right label in order to know the status of the various
event tracks.