Payload support

core/src/mindustry/io/TypeIO.java

@@ -17,6 +17,7 @@ import mindustry.net.Packets.*;
 import mindustry.type.*;
 import mindustry.world.*;
 import mindustry.world.blocks.*;
+import mindustry.world.blocks.payloads.*;
 
 import java.io.*;
 import java.nio.*;
@@ -87,6 +88,14 @@ public class TypeIO{
         }
     }
 
+    public static void writePayload(Writes writes, Payload payload){
+        Payload.write(payload, writes);
+    }
+
+    public static Payload readPayload(Reads read){
+        return Payload.read(read);
+    }
+
     //only for players!
     public static void writeUnit(Writes write, Unitc unit){
         write.b(unit.isNull() ? 0 : unit instanceof BlockUnitc ? 1 : 2);