Unwrap Event Exceptions

This was a useless exception wrapper that ends up making
stack traces harder to read as well as the JVM cutting off
the important parts

Nothing catches this exception, so its safe to just get rid
of it and let the REAL exception bubble down

Spigot-API-Patches/0039-Add-source-to-PlayerExpChangeEvent.patch

@@ -1,56 +0,0 @@
-From 47a6be4ee58f0b7650ee3f74933311d0e0dbab0e Mon Sep 17 00:00:00 2001
-From: AlphaBlend <whizkid3000@hotmail.com>
-Date: Thu, 8 Sep 2016 08:47:08 -0700
-Subject: [PATCH] Add source to PlayerExpChangeEvent
-
-
-diff --git a/src/main/java/org/bukkit/event/player/PlayerExpChangeEvent.java b/src/main/java/org/bukkit/event/player/PlayerExpChangeEvent.java
-index f37491d7..30882559 100644
---- a/src/main/java/org/bukkit/event/player/PlayerExpChangeEvent.java
-+++ b/src/main/java/org/bukkit/event/player/PlayerExpChangeEvent.java
-@@ -1,20 +1,42 @@
- package org.bukkit.event.player;
- 
-+import org.bukkit.entity.Entity; // Paper
- import org.bukkit.entity.Player;
- import org.bukkit.event.HandlerList;
- 
-+import javax.annotation.Nullable; // Paper
-+
- /**
-  * Called when a players experience changes naturally
-  */
- public class PlayerExpChangeEvent extends PlayerEvent {
-     private static final HandlerList handlers = new HandlerList();
-+    // Paper start
-+    @Nullable
-+    private final Entity source;
-     private int exp;
- 
-     public PlayerExpChangeEvent(final Player player, final int expAmount) {
-+          this(player, null, expAmount);
-+    }
-+
-+    public PlayerExpChangeEvent(final Player player, @Nullable final Entity sourceEntity, final int expAmount) {
-          super(player);
-+         source = sourceEntity;
-          exp = expAmount;
-     }
- 
-+    /**
-+     * Get the source that provided the experience.
-+     *
-+     * @return The source of the experience
-+     */
-+    @Nullable
-+    public Entity getSource() {
-+        return source;
-+    }
-+    // Paper end
-+
-     /**
-      * Get the amount of experience the player will receive
-      *
--- 
-2.18.0
-