Remove legacy websocket message handling

CryptoExchange.Net/Objects/Options/SocketExchangeOptions.cs

@@ -75,11 +75,6 @@ namespace CryptoExchange.Net.Objects.Options
         /// </remarks>
         public int? ReceiveBufferSize { get; set; }
 
-        /// <summary>
-        /// Whether or not to use the updated deserialization logic, default is true
-        /// </summary>
-        public bool UseUpdatedDeserialization { get; set; } = true;
-
         /// <summary>
         /// Create a copy of this options
         /// </summary>
@@ -101,7 +96,6 @@ namespace CryptoExchange.Net.Objects.Options
             item.RateLimitingBehaviour = RateLimitingBehaviour;
             item.RateLimiterEnabled = RateLimiterEnabled;
             item.ReceiveBufferSize = ReceiveBufferSize;
-            item.UseUpdatedDeserialization = UseUpdatedDeserialization;
             return item;
         }
     }

CryptoExchange.Net/Objects/Sockets/WebSocketParameters.cs

@@ -73,11 +73,6 @@ namespace CryptoExchange.Net.Objects.Sockets
         /// The buffer size to use for receiving data
         /// </summary>
         public int? ReceiveBufferSize { get; set; } = null;
-        
-        /// <summary>
-        /// Whether or not to use the updated deserialization logic
-        /// </summary>
-        public bool UseUpdatedDeserialization { get; set; }
 
         /// <summary>
         /// ctor