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/0037-Disallow-Interaction-With-Self.patch

@@ -0,0 +1,25 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: md_5 <md_5@live.com.au>
+Date: Fri, 28 Jun 2013 19:52:54 +1000
+Subject: [PATCH] Disallow Interaction With Self
+
+
+diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/PlayerConnection.java
++++ b/src/main/java/net/minecraft/server/PlayerConnection.java
+@@ -0,0 +0,0 @@ public class PlayerConnection implements PacketPlayInListener {
+         if (this.player.dead) return; // CraftBukkit
+         WorldServer worldserver = this.minecraftServer.getWorldServer(this.player.dimension);
+         Entity entity = packetplayinuseentity.a((World) worldserver);
++        // Spigot Start
++        if ( entity == player )
++        {
++            disconnect( "Cannot interact with self!" );
++            return;
++        }
++        // Spigot End
+ 
+         this.player.v();
+         if (entity != null) {
+--