fix(core): Removes 6017 handler (#411)

- [X] Removes 6017 handler since it is only used in one place
- [X] Exposes a ref int to modify the packet length. This is acceptable since we technically have access to the entire reader/buffer.

Projects/Server/Network/Packets/IncomingHousePackets.cs

@@ -22,7 +22,7 @@ namespace Server.Network
             IncomingPackets.Register(0xFB, 2, false, ShowPublicHouseContent);
         }
 
-        public static void ShowPublicHouseContent(NetState state, CircularBufferReader reader)
+        public static void ShowPublicHouseContent(NetState state, CircularBufferReader reader, ref int packetLength)
         {
             var showPublicHouseContent = reader.ReadBoolean();
         }