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* Add migrating message Signed-off-by: Andrew Thornton <art27@cantab.net> * simplify messenger Signed-off-by: Andrew Thornton <art27@cantab.net> * make messenger an interface Signed-off-by: Andrew Thornton <art27@cantab.net> * rename Signed-off-by: Andrew Thornton <art27@cantab.net> * prepare for merge Signed-off-by: Andrew Thornton <art27@cantab.net> * as per tech Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: 6543 <6543@obermui.de>