Code Generation for TypedKeys (#9233)

Currently includes generated key holder classes for types
used in the Registry Modification API

patches/api/0122-Entity-getChunk-API.patch

@@ -0,0 +1,36 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Wed, 4 Jul 2018 02:25:48 -0400
+Subject: [PATCH] Entity#getChunk API
+
+Get the chunk the entity is currently registered to
+
+diff --git a/src/main/java/org/bukkit/entity/Entity.java b/src/main/java/org/bukkit/entity/Entity.java
+index 4319dbac54b4cce95ad7479d5bd141a2b12ab7ae..5fc085f785719933eef7ab1b3cf173579c64739b 100644
+--- a/src/main/java/org/bukkit/entity/Entity.java
++++ b/src/main/java/org/bukkit/entity/Entity.java
+@@ -3,6 +3,7 @@ package org.bukkit.entity;
+ import java.util.List;
+ import java.util.Set;
+ import java.util.UUID;
++import org.bukkit.Chunk; // Paper
+ import org.bukkit.EntityEffect;
+ import org.bukkit.Location;
+ import org.bukkit.Nameable;
+@@ -756,5 +757,16 @@ public interface Entity extends Metadatable, CommandSender, Nameable, Persistent
+      * @return True if entity spawned from a mob spawner
+      */
+     boolean fromMobSpawner();
++
++    /**
++     * Gets the latest chunk an entity is currently or was in.
++     *
++     * @return The current, or most recent chunk if the entity is invalid (which may load the chunk)
++     */
++    @NotNull
++    default Chunk getChunk() {
++        // TODO remove impl here
++        return getLocation().getChunk();
++    }
+     // Paper end
+ }