Add more debug info in packet parsing errors

For diagnosing #710 and other future packet parsing errors

MinecraftClient/Protocol/Handlers/Protocol18.cs

@@ -401,6 +401,8 @@ namespace MinecraftClient.Protocol.Handlers
         /// <param name="packetData">Packet contents</param>
         /// <returns>TRUE if the packet was processed, FALSE if ignored or unknown</returns>
         private bool handlePacket(int packetID, List<byte> packetData)
+        {
+            try
             {
                 if (login_phase)
                 {
@@ -854,6 +856,18 @@ namespace MinecraftClient.Protocol.Handlers
                 }
                 return true; //Packet processed
             }
+            catch (Exception innerException)
+            {
+                throw new System.IO.InvalidDataException(
+                    String.Format("Failed to process incoming packet of type {0}. (PacketID: {1}, Protocol: {2}, LoginPhase: {3}, InnerException: {4}).",
+                        getPacketIncomingType(packetID, protocolversion),
+                        packetID,
+                        protocolversion,
+                        login_phase,
+                        innerException.GetType()),
+                    innerException);
+            }
+        }
 
         /// <summary>
         /// Process chunk column data from the server and (un)load the chunk from the Minecraft world