More netcode updates

core/src/mindustry/net/Net.java

@@ -257,6 +257,7 @@ public class Net{
      * Call to handle a packet being received for the client.
      */
     public void handleClientReceived(Packet object){
+        object.handled();
 
         if(object instanceof StreamBegin b){
             streams.put(b.id, currentStream = new StreamBuilder(b));
@@ -291,6 +292,8 @@ public class Net{
      * Call to handle a packet being received for the server.
      */
     public void handleServerReceived(NetConnection connection, Packet object){
+        object.handled();
+
         try{
             //handle object normally
             if(serverListeners.get(object.getClass()) != null){

core/src/mindustry/net/Packet.java

@@ -10,6 +10,7 @@ public abstract class Packet{
     //readObject
     //readBuilding
     //readUnit (possibly)
+    protected static final byte[] NODATA = {};
     protected static final ReusableByteInStream BAIS = new ReusableByteInStream();
     protected static final Reads READ = new Reads(new DataInputStream(BAIS));
 
@@ -29,6 +30,8 @@ public abstract class Packet{
         read(read);
     }
 
+    public void handled(){}
+
     public int getPriority(){
         return priorityNormal;
     }