Ability death listener

core/src/mindustry/entities/abilities/Ability.java

@@ -7,6 +7,7 @@ import mindustry.gen.*;
 public abstract class Ability implements Cloneable{
     public void update(Unit unit){}
     public void draw(Unit unit){}
+    public void death(Unit unit){}
 
     public Ability copy(){
         try{

core/src/mindustry/entities/comp/UnitComp.java

@@ -517,6 +517,12 @@ abstract class UnitComp implements Healthc, Physicsc, Hitboxc, Statusc, Teamc, I
             }
         }
 
+        if(abilities.size > 0){
+            for(Ability a : abilities){
+                a.death(self());
+            }
+        }
+
         remove();
     }