Updated to MonoGame 3.6 + Directory refactor

- Barotrauma's projects are in the Barotrauma directory
- All libraries are in the Libraries directory
- MonoGame is now managed by NuGet, rather than referenced from the installed files (TODO: consider using PCL for easier cross-platform development?)
- NuGet libraries are not included in the repo, as getting the latest versions automatically should be preferred
- Removed Content/effects.mgfx as it didn't seem to be used anywhere
- Removed some references to Subsurface directory
- Renamed Launcher2 to Launcher

Libraries/Lidgren.Network/Encryption/NetXorEncryption.cs

@@ -0,0 +1,66 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Lidgren.Network
+{
+	/// <summary>
+	/// Example class; not very good encryption
+	/// </summary>
+	public class NetXorEncryption : NetEncryption
+	{
+		private byte[] m_key;
+
+		/// <summary>
+		/// NetXorEncryption constructor
+		/// </summary>
+		public NetXorEncryption(NetPeer peer, byte[] key)
+			: base(peer)
+		{
+			m_key = key;
+		}
+
+		public override void SetKey(byte[] data, int offset, int count)
+		{
+			m_key = new byte[count];
+			Array.Copy(data, offset, m_key, 0, count);
+		}
+
+		/// <summary>
+		/// NetXorEncryption constructor
+		/// </summary>
+		public NetXorEncryption(NetPeer peer, string key)
+			: base(peer)
+		{
+			m_key = Encoding.UTF8.GetBytes(key);
+		}
+
+		/// <summary>
+		/// Encrypt an outgoing message
+		/// </summary>
+		public override 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 override 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;
+		}
+	}
+}