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/Encryption/NetXorEncryption.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Lidgren.Network
+{
+	/// <summary>
+	/// Example class; not very good encryption
+	/// </summary>
+	public class NetXorEncryption : INetEncryption
+	{
+		private byte[] m_key;
+
+		/// <summary>
+		/// NetXorEncryption constructor
+		/// </summary>
+		public NetXorEncryption(byte[] key)
+		{
+			m_key = key;
+		}
+
+		/// <summary>
+		/// NetXorEncryption constructor
+		/// </summary>
+		public NetXorEncryption(string key)
+		{
+			m_key = Encoding.UTF8.GetBytes(key);
+		}
+
+		/// <summary>
+		/// Encrypt an outgoing message
+		/// </summary>
+		public bool Encrypt(NetOutgoingMessage msg)
+		{
+			int numBytes = msg.LengthBytes;
+			for (int i = 0; i < numBytes; i++)
+			{
+				int offset = i % m_key.Length;
+				msg.m_data[i] = (byte)(msg.m_data[i] ^ m_key[offset]);
+			}
+			return true;
+		}
+
+		/// <summary>
+		/// Decrypt an incoming message
+		/// </summary>
+		public bool Decrypt(NetIncomingMessage msg)
+		{
+			int numBytes = msg.LengthBytes;
+			for (int i = 0; i < numBytes; i++)
+			{
+				int offset = i % m_key.Length;
+				msg.m_data[i] = (byte)(msg.m_data[i] ^ m_key[offset]);
+			}
+			return true;
+		}
+	}
+}