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/SenderChannelBase.cs

@@ -0,0 +1,11 @@
+using System;
+
+namespace Lidgren.Network
+{
+	internal abstract class SenderChannelBase
+	{
+		internal abstract NetSendResult Send(float now, NetOutgoingMessage message);
+		internal abstract void SendQueuedMessages(float now);
+		internal abstract void Reset();
+	}
+}