[MERGE] mail: clearly separate email from inbox notification management

This merge changes the way odoo handles notifications. Previously
notifications were sent to the odoo inbox and forwarded by email
depending on a parameter on the partner. Now users choose whether to
use odoo inbox or email but not both. Customers only work using
emails from now on.

This merge also features side commits linked to notifications and mail
like making mail tests less dependent on channels, the removal of auto
read in channels, limitation of assigned emails and project subscription
improvements.

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