Code Generation for TypedKeys (#9233)

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

patches/api/0081-Ability-to-apply-mending-to-XP-API.patch

@@ -0,0 +1,53 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Wed, 20 Dec 2017 17:38:07 -0500
+Subject: [PATCH] Ability to apply mending to XP API
+
+This allows plugins that give players the ability to apply the experience
+points to the Item Mending formula, which will repair an item instead
+of giving the player experience points.
+
+Both an API To standalone mend, and apply mending logic to .giveExp has been added.
+
+diff --git a/src/main/java/org/bukkit/entity/Player.java b/src/main/java/org/bukkit/entity/Player.java
+index f9239eae50b86f54f0cd8c604d2ba9468fc5f33b..9dca8fc727b727063d9ca50fdd8f6452173a5cd4 100644
+--- a/src/main/java/org/bukkit/entity/Player.java
++++ b/src/main/java/org/bukkit/entity/Player.java
+@@ -1368,6 +1368,15 @@ public interface Player extends HumanEntity, Conversable, OfflinePlayer, PluginM
+      */
+     public void resetPlayerWeather();
+ 
++    // Paper start
++    /**
++     * Gives the player the amount of experience specified.
++     *
++     * @param amount Exp amount to give
++     */
++    public default void giveExp(int amount) {
++        giveExp(amount, false);
++    }
+     /**
+      * Gets the player's cooldown between picking up experience orbs.
+      *
+@@ -1393,8 +1402,20 @@ public interface Player extends HumanEntity, Conversable, OfflinePlayer, PluginM
+      * Gives the player the amount of experience specified.
+      *
+      * @param amount Exp amount to give
++     * @param applyMending Mend players items with mending, with same behavior as picking up orbs. calls {@link #applyMending(int)}
+      */
+-    public void giveExp(int amount);
++    public void giveExp(int amount, boolean applyMending);
++
++    /**
++     * Applies the mending effect to any items just as picking up an orb would.
++     *
++     * Can also be called with {@link #giveExp(int, boolean)} by passing true to applyMending
++     *
++     * @param amount Exp to apply
++     * @return the remaining experience
++     */
++    public int applyMending(int amount);
++    // Paper end
+ 
+     /**
+      * Gives the player the amount of experience levels specified. Levels can