Purpose
=======
Show an icon representing the state of the event mail and number of contacted
registrations instead of the simple checkbox "sent".
Specifications
==============
Instead of the checkbox "sent", an event mail can have 3 values
1. Sent, if all the mails has been sent;
2. Scheduled, if scheduled but no attendee have been contacted;
3. Running, if not all attendees have been contacted;
Note that communication targeting "after registration" are always considered
as being "running" as any new registration triggers a new communication.
A new widget is added that displays an icon depending on the state.
A new field holding contact count is added. When scheduler send emails it is
updated to keep a count of sent communications.
LINKS
Task ID-2414658
COM PR odoo/odoo#63093
UPG PR odoo/upgrade#2014
Debauche Stéphane
69df7d3d8a