MailDeliveryJob to updates with settings and avoids needing to restart. #2075
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Extension of MailDeliveryJob to update smtp settings before running.
Also always start the mailer job, but only send mails if enabled, to avoid having to restart the jobs if enabling email. ( I'm in 2 minds about this and open to reverting it after review. )
Added a note that when queuing a test email, the settings need to have been saved first.