Example use case (see Deaths discussion): "Some of our editors are dead, most will likely die in the future [Citation needed]. While we don't always know which of our editors have died, when we do know we should exclude such editors from messages from tools like this. This is not just to save electrons, dead people often have friends and family monitoring their feeds. On the English language Wikipedia you can check for such editors by looking for the template {{deceased}} on their user pages, other languages may have similar systems." - @WereSpielChequers

Acceptance Criteria:

• Allow wiki admins to specify templates and/or categories that would automatically exclude users from being in invitation lists if those templates were on their user pages