Fix some players not being kicked on shutdown

Closes GH-8

Spigot-Server-Patches/0019-Player-affects-spawning-API.patch

@@ -1,4 +1,4 @@
-From 7db15879def797030fee0b06144841db99e44c98 Mon Sep 17 00:00:00 2001
+From 2c0e6a7dc46e9b8862871d672e57651b019f5cd6 Mon Sep 17 00:00:00 2001
 From: Jedediah Smith <jedediah@silencegreys.com>
 Date: Tue, 1 Mar 2016 14:47:52 -0600
 Subject: [PATCH] Player affects spawning API

Spigot-Server-Patches/0136-Fix-some-players-not-being-kicked-on-shutdown.patch

@@ -0,0 +1,27 @@
+From 56ac5514f341eb1a9b4ca36bce41ba88181b214c Mon Sep 17 00:00:00 2001
+From: Jedediah Smith <jedediah@silencegreys.com>
+Date: Tue, 29 Mar 2016 20:19:20 -0400
+Subject: [PATCH] Fix some players not being kicked on shutdown
+
+
+diff --git a/src/main/java/net/minecraft/server/PlayerList.java b/src/main/java/net/minecraft/server/PlayerList.java
+index 94f122d..d4de4e9 100644
+--- a/src/main/java/net/minecraft/server/PlayerList.java
++++ b/src/main/java/net/minecraft/server/PlayerList.java
+@@ -1292,9 +1292,11 @@ public abstract class PlayerList {
+     }
+ 
+     public void u() {
+-        for (int i = 0; i < this.players.size(); ++i) {
+-            ((EntityPlayer) this.players.get(i)).playerConnection.disconnect(this.server.server.getShutdownMessage()); // CraftBukkit - add custom shutdown message
++        // Paper start - Fix players being skipped due to concurrent list modification
++        for (EntityPlayer player : com.google.common.collect.ImmutableList.copyOf(this.players)) {
++            player.playerConnection.disconnect(this.server.server.getShutdownMessage()); // CraftBukkit - add custom shutdown message
+         }
++        // Paper end
+ 
+     }
+ 
+-- 
+2.8.0
+