Protocol changes for 1.7

there's also some new cases in stats, but we don't care about those anyway.

src/pocketmine/network/mcpe/protocol/PacketPool.php

@@ -146,6 +146,7 @@ class PacketPool{
 		static::registerPacket(new SetLocalPlayerAsInitializedPacket());
 		static::registerPacket(new UpdateSoftEnumPacket());
 		static::registerPacket(new NetworkStackLatencyPacket());
+		static::registerPacket(new ScriptCustomEventPacket());
 
 		static::registerPacket(new BatchPacket());
 	}