Change manual packet numbering to a dictionary

MistoxServer/Server/ServerConnection.cs

@@ -43,8 +43,8 @@ namespace Mistox.Server {
 
                         // Pack the header variables for faster memory passing
                         DataPacketHeader Header = new DataPacketHeader {
-                            Type = headerBuffer[0],
-                            DataLength = (ushort)((headerBuffer[1] << 8) | headerBuffer[2])
+                            Type = (ushort)((headerBuffer[0] << 8) | headerBuffer[1]),
+                            DataLength = (ushort)((headerBuffer[2] << 8) | headerBuffer[3])
                         };
 
                         // Make sure the data looks valid