add EF core db migrations, add banned + forbidden uploads db entries, adjust authentication to include characternamehash to check for bans, prepare for message sending from client to other clients

MareSynchronosServer/MareSynchronos.API/ClientPairDto.cs

@@ -7,5 +7,6 @@
         public bool IsSynced { get; set; }
         public bool IsPausedFromOthers { get; set; }
         public bool IsRemoved { get; set; }
+        public bool AllowReceiveMessages { get; set; }
     }
 }