Add handling for liquid net module

TShockAPI/Handlers/NetModules/LiquidHandler.cs

@@ -0,0 +1,29 @@
+using System.IO;
+
+namespace TShockAPI.Handlers.NetModules
+{
+	/// <summary>
+	/// Handles the NetLiquidModule. Rejects all incoming net liquid requests, as clients should never send them
+	/// </summary>
+	public class LiquidHandler : INetModuleHandler
+	{
+		/// <summary>
+		/// Does nothing. We should not deserialize this data
+		/// </summary>
+		/// <param name="data"></param>
+		public void Deserialize(MemoryStream data)
+		{
+			// No need to deserialize
+		}
+
+		/// <summary>
+		/// Rejects the packet. Clients should not send this to us
+		/// </summary>
+		/// <param name="player"></param>
+		/// <param name="rejectPacket"></param>
+		public void HandlePacket(TSPlayer player, out bool rejectPacket)
+		{
+			rejectPacket = true;
+		}
+	}
+}

TShockAPI/Handlers/NetModules/NetModulePacketHandler.cs

@@ -1,5 +1,4 @@
-using System;
-using Terraria;
+using Terraria;
 using static TShockAPI.GetDataHandlers;
 
 namespace TShockAPI.Handlers.NetModules
@@ -48,6 +47,11 @@ namespace TShockAPI.Handlers.NetModules
 						handler = new PylonHandler();
 						break;
 					}
+				case NetModulesTypes.Liquid:
+					{
+						handler = new LiquidHandler();
+						break;
+					}
 				default:
 					{
 						// As of 1.4.x.x, this is now used for more things: