Restructure PaperSpigot as a new set of modules

Allows us much greater control over the Spigot portion of the code
and makes us more "proper"
Credit to @Dmck2b for originally passing the idea along a while back

CraftBukkit-Patches/0040-Prevent-Ghost-Players-Caused-by-Plugins.patch

@@ -0,0 +1,24 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Alex Ciuba <alexciuba@gmail.com>
+Date: Tue, 11 Jun 2013 15:23:03 -0400
+Subject: [PATCH] Prevent Ghost Players Caused by Plugins
+
+Check if the player is still connected after firing event. Fixes BUKKIT-4327
+
+diff --git a/src/main/java/net/minecraft/server/PlayerList.java b/src/main/java/net/minecraft/server/PlayerList.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/PlayerList.java
++++ b/src/main/java/net/minecraft/server/PlayerList.java
+@@ -0,0 +0,0 @@ public abstract class PlayerList {
+             Player respawnPlayer = this.cserver.getPlayer(entityplayer1);
+             PlayerRespawnEvent respawnEvent = new PlayerRespawnEvent(respawnPlayer, location, isBedSpawn);
+             this.cserver.getPluginManager().callEvent(respawnEvent);
++            // Spigot Start
++            if (entityplayer.playerConnection.isDisconnected()) {
++                return entityplayer;
++            }
++            // Spigot End
+ 
+             location = respawnEvent.getRespawnLocation();
+             entityplayer.reset();
+--