Updated uCore, fixed GWT build, better client snapshot system

core/src/io/anuke/mindustry/io/TypeIO.java

@@ -3,6 +3,7 @@ package io.anuke.mindustry.io;
 import io.anuke.annotations.Annotations.ReadClass;
 import io.anuke.annotations.Annotations.WriteClass;
 import io.anuke.mindustry.entities.Player;
+import io.anuke.mindustry.entities.Unit;
 import io.anuke.mindustry.game.Team;
 import io.anuke.mindustry.net.Packets.KickReason;
 import io.anuke.mindustry.type.Item;
@@ -10,6 +11,7 @@ import io.anuke.mindustry.type.Recipe;
 import io.anuke.mindustry.type.Upgrade;
 import io.anuke.mindustry.type.Weapon;
 import io.anuke.mindustry.world.Tile;
+import io.anuke.ucore.entities.Entities;
 
 import java.nio.ByteBuffer;
 
@@ -34,6 +36,19 @@ public class TypeIO {
         return id == -1 ? null : playerGroup.getByID(id);
     }
 
+    @WriteClass(Unit.class)
+    public static void writeUnit(ByteBuffer buffer, Unit unit){
+        buffer.put((byte)unit.getGroup().getID());
+        buffer.putInt(unit.getID());
+    }
+
+    @ReadClass(Unit.class)
+    public static Unit writeUnit(ByteBuffer buffer){
+        byte gid = buffer.get();
+        int id = buffer.getInt();
+        return (Unit)Entities.getGroup(gid).getByID(id);
+    }
+
     @WriteClass(Tile.class)
     public static void writeTile(ByteBuffer buffer, Tile tile){
         buffer.putInt(tile.packedPosition());