New permission for sending emails

Some users wanted to give writers access to draft emails, but not to send them. Now, they can!

We separated the permission for sending emails from permission for writing and managing of emails, which means that you can invite writers to write drafts directly in Buttondown, but only allow administrators to actually send them to subscribers.

Don't worry: if users in your team already had access to send emails before, they'll be automatically granted this new permission.