Remove Tabs when disconnect

Server/Client.cs

@@ -127,6 +127,9 @@ namespace Server
                         Console.WriteLine($"set resistance worked is " + worked);
                         //set resistance on doctor GUI
                         break;
+                    case DataParser.DISCONNECT:
+                        communication.Disconnect(this);
+                        break;
                     default:
                         Console.WriteLine($"Received json with identifier {identifier}:\n{Encoding.ASCII.GetString(payloadbytes)}");
                         break;

Server/Communication.cs

@@ -49,6 +49,7 @@ namespace Server
         internal void Disconnect(Client client)
         {
             clients.Remove(client);
+            doctor.sendMessage(DataParser.getDisconnectJson(client.username));
         }
 
         public void NewLogin(Client client)