refactor: Made OwnedObjects readonly

Author: TwoTenPvP

MLAPI/Connection/NetworkedClient.cs

@@ -18,7 +18,7 @@ public class NetworkedClient
         /// <summary>
         /// The NetworkedObject's owned by this Client
         /// </summary>
-        public List<NetworkedObject> OwnedObjects = new List<NetworkedObject>();
+        public readonly List<NetworkedObject> OwnedObjects = new List<NetworkedObject>();
         /// <summary>
         /// The encryption key used for this client
         /// </summary>