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;
+		}
+	}
+}