Progress on tutorial, gap tweaking (water flows faster from room to room), UPnP error messages, input keys in array, underwater aiming tweaking, tons of misc stuff commit more often ffs

Lidgren.Network/NetUnreliableSequencedReceiver.cs

@@ -0,0 +1,29 @@
+using System;
+
+namespace Lidgren.Network
+{
+	internal sealed class NetUnreliableSequencedReceiver : NetReceiverChannelBase
+	{
+		private int m_lastReceivedSequenceNumber;
+
+		public NetUnreliableSequencedReceiver(NetConnection connection)
+			: base(connection)
+		{
+		}
+
+		internal override void ReceiveMessage(NetIncomingMessage msg)
+		{
+			int nr = msg.m_sequenceNumber;
+
+			// ack no matter what
+			m_connection.QueueAck(msg.m_receivedMessageType, nr);
+
+			int relate = NetUtility.RelativeSequenceNumber(nr, m_lastReceivedSequenceNumber);
+			if (relate < 0)
+				return; // drop if late
+
+			m_lastReceivedSequenceNumber = nr;
+			m_peer.ReleaseMessage(msg);
+		}
+	}
+}