added ability to modify age of entities

src/main/java/carpet/script/value/EntityValue.java

@@ -517,6 +517,7 @@ public class EntityValue extends Value
 
     private static final Map<String, BiConsumer<Entity, Value>> featureModifiers = new HashMap<String, BiConsumer<Entity, Value>>() {{
         put("remove", (entity, value) -> entity.remove());
+        put("age", (e, v) -> e.age = Math.abs((int)NumericValue.asNumber(v).getLong()) );
         put("health", (e, v) -> { if (e instanceof LivingEntity) ((LivingEntity) e).setHealth((float) NumericValue.asNumber(v).getDouble()); });
         put("kill", (e, v) -> e.kill());
         put("location", (e, v) ->