cubicweb-forge #343841 implement nosy list for Ticket [resolved]

We should be able to decide which recipients is appropriate when sending out notifications. In particular for all events related to the Ticket entity, creator/owner/modifier/managers, users interested in the project it belongs to, users who commented the ticket, should be informed of all the changes on a ticket.

prioritynormal
typebug
done in1.1.0
load1.500
load left0.000
closed by<not specified>