Initial Paper-API for Bukkit 1.13 Preview 4 - THIS IS NOT SERVER

This branch/commit is only useful to those who purely use a clean Bukkit/Spigot/Paper API
and does not use NMS/OBC references.

This will let you start updating your plugin to the latest 1.13 builds of Bukkit Preview (4 as of now)

Note that this release is not final!!! API breakages may occur!

It is up to you if you find use out of this work.

pre/Bukkit-Patches/0006-Add-Arrow-API.patch

@@ -0,0 +1,27 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: md_5 <md_5@live.com.au>
+Date: Sun, 2 Jun 2013 15:08:24 +1000
+Subject: [PATCH] Add Arrow API
+
+
+diff --git a/src/main/java/org/bukkit/entity/Arrow.java b/src/main/java/org/bukkit/entity/Arrow.java
+index c77f3a4f..99814eee 100644
+--- a/src/main/java/org/bukkit/entity/Arrow.java
++++ b/src/main/java/org/bukkit/entity/Arrow.java
+@@ -0,0 +0,0 @@ public interface Arrow extends Projectile {
+     public class Spigot extends Entity.Spigot
+     {
+ 
++        public double getDamage()
++        {
++            throw new UnsupportedOperationException( "Not supported yet." );
++        }
++
++        public void setDamage(double damage)
++        {
++            throw new UnsupportedOperationException( "Not supported yet." );
++        }
+     }
+ 
+     @Override
+--