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/NetRC2Encryption.cs

@@ -0,0 +1,26 @@
+using System;
+using System.IO;
+using System.Security.Cryptography;
+
+namespace Lidgren.Network
+{
+	public class NetRC2Encryption : NetCryptoProviderBase
+	{
+		public NetRC2Encryption(NetPeer peer)
+			: base(peer, new RC2CryptoServiceProvider())
+		{
+		}
+
+		public NetRC2Encryption(NetPeer peer, string key)
+			: base(peer, new RC2CryptoServiceProvider())
+		{
+			SetKey(key);
+		}
+
+		public NetRC2Encryption(NetPeer peer, byte[] data, int offset, int count)
+			: base(peer, new RC2CryptoServiceProvider())
+		{
+			SetKey(data, offset, count);
+		}
+	}
+}