Remove KeyedObject interface (#7680)

patches/server/0149-LivingEntity-setKiller.patch

@@ -1,35 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: BillyGalbreath <Blake.Galbreath@GMail.com>
-Date: Mon, 31 Jul 2017 01:49:48 -0500
-Subject: [PATCH] LivingEntity#setKiller
-
-
-diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
-index b65d44780c7e6e1e2e8724df838d1aa54edcc30a..6455a81fea0de79173419587171b5ed025c30592 100644
---- a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
-+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
-@@ -8,6 +8,7 @@ import java.util.Iterator;
- import java.util.List;
- import java.util.Set;
- import java.util.UUID;
-+import net.minecraft.server.level.ServerPlayer;
- import net.minecraft.world.InteractionHand;
- import net.minecraft.world.damagesource.DamageSource;
- import net.minecraft.world.effect.MobEffect;
-@@ -344,6 +345,16 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
-         return this.getHandle().lastHurtByPlayer == null ? null : (Player) this.getHandle().lastHurtByPlayer.getBukkitEntity();
-     }
- 
-+    // Paper start
-+    @Override
-+    public void setKiller(Player killer) {
-+        ServerPlayer entityPlayer = killer == null ? null : ((CraftPlayer) killer).getHandle();
-+        getHandle().lastHurtByPlayer = entityPlayer;
-+        getHandle().lastHurtByMob = entityPlayer;
-+        getHandle().lastHurtByPlayerTime = entityPlayer == null ? 0 : 100; // 100 value taken from EntityLiving#damageEntity
-+    }
-+    // Paper end
-+
-     @Override
-     public boolean addPotionEffect(PotionEffect effect) {
-         return this.addPotionEffect(effect, false);