Merged Cake and Abel branched into 2.0.3 (#131)

Co-authored-by: azyges <aaaaaa@aaa.aaa>
Co-authored-by: cake <admin@cakeandbanana.nl>
Co-authored-by: defnotken <itsdefnotken@gmail.com>
Reviewed-on: #131

LightlessSync/PlayerData/Pairs/PairCoordinator.Users.cs

@@ -125,6 +125,7 @@ public sealed partial class PairCoordinator
             }
         }
 
+        _mediator.Publish(new PairOnlineMessage(new PairUniqueIdentifier(dto.User.UID)));
         PublishPairDataChanged();
     }