uniform disc dropper respawns

src/engine/objects/Mob.java

@@ -32,6 +32,7 @@ import org.pmw.tinylog.Logger;
 
 import java.sql.ResultSet;
 import java.sql.SQLException;
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.concurrent.ConcurrentHashMap;
@@ -42,7 +43,7 @@ import static engine.net.client.msg.ErrorPopupMsg.sendErrorPopup;
 public class Mob extends AbstractIntelligenceAgent {
 
     private static int staticID = 0;
-
+    public static ArrayList<Mob> disciplineDroppers = new ArrayList<>();
     public static HashMap<Integer,Mob> dynamic_pets = new HashMap<>();
     //mob specific
     public final ConcurrentHashMap<Integer, Float> playerAgroMap = new ConcurrentHashMap<>(); //key = Player value = hate value