Implemented Sneak event

src/main/java/net/minecraft/server/NetServerHandler.java

@@ -24,6 +24,7 @@ import org.bukkit.event.player.PlayerItemEvent;
 import org.bukkit.event.player.PlayerItemHeldEvent;
 import org.bukkit.event.player.PlayerKickEvent;
 import org.bukkit.event.player.PlayerMoveEvent;
+import org.bukkit.event.player.PlayerToggleSneakEvent;
 import org.bukkit.plugin.Plugin;
 // CraftBukkit end
 
@@ -652,6 +653,17 @@ public class NetServerHandler extends NetHandler implements ICommandListener {
     }
 
     public void a(Packet19EntityAction packet19entityaction) {
+        // CraftBukkit: Toggle Sneak
+        if (packet19entityaction.b == 1 || packet19entityaction.b == 2) {
+            Player player = getPlayer();
+            PlayerToggleSneakEvent event = new PlayerToggleSneakEvent(Type.PLAYER_TOGGLE_SNEAK, player);
+            server.getPluginManager().callEvent(event);
+            if (event.isCancelled()) {
+                return;
+            }
+        }
+        // CraftBukkit: Set Sneaking
+
         if (packet19entityaction.b == 1) {
             this.e.b(true);
         } else if (packet19entityaction.b == 2) {

src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java

@@ -150,4 +150,12 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
             entity.a.a(location.getX(), location.getY(), location.getZ(), location.getYaw(), location.getPitch());
         }
     }
+
+    public void setSneaking(boolean sneak) {
+        entity.b(sneak);
+    }
+
+    public boolean isSneaking() {
+        return entity.J();
+    }
 }