Add emergency message macro, amend contact page to use it, pass emergency message on to template to only display message when switch on.
Add emergency message macro, amend contact page to use it,
pass emergency message on to template to only display message
when switch on.

ministryofjustice/cla_public,ministryofjustice/cla_public,ministryofjustice/cla_public,ministryofjustice/cla_public