add EntityTargetLivingEntityEvent for new 1.16 mobs (#3782)

Spigot-API-Patches/0215-added-2-new-TargetReasons-for-1.16-mob-behavior.patch

@@ -0,0 +1,25 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Jake Potrebic <jake.m.potrebic@gmail.com>
+Date: Fri, 3 Jul 2020 15:05:54 -0700
+Subject: [PATCH] added 2 new TargetReasons for 1.16 mob behavior
+
+
+diff --git a/src/main/java/org/bukkit/event/entity/EntityTargetEvent.java b/src/main/java/org/bukkit/event/entity/EntityTargetEvent.java
+index dee186e99463a56394bbc2039d1e763d109125b9..601904150156d475c18286b485f3409307a75950 100644
+--- a/src/main/java/org/bukkit/event/entity/EntityTargetEvent.java
++++ b/src/main/java/org/bukkit/event/entity/EntityTargetEvent.java
+@@ -159,6 +159,14 @@ public class EntityTargetEvent extends EntityEvent implements Cancellable {
+          * as wheat in it's hand.
+          */
+         TEMPT,
++        /**
++         * When the target is in a different dimension
++         */
++        TARGET_OTHER_LEVEL, // Paper
++        /**
++         * When the target is in creative or spectator mode, or the gamemode is peaceful, or other reasons
++         */
++        TARGET_INVALID, // Paper
+         /**
+          * A currently unknown reason for the entity changing target.
+          */