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

Barotrauma/BarotraumaShared/Source/Networking/INetSerializable.cs

@@ -0,0 +1,29 @@
+using System;
+using Lidgren.Network;
+
+namespace Barotrauma.Networking
+{
+    interface INetSerializable { }
+
+    /// <summary>
+    /// Interface for entities that the clients can send information of to the server
+    /// </summary>
+    interface IClientSerializable : INetSerializable
+    {
+#if CLIENT
+        void ClientWrite(NetBuffer msg, object[] extraData = null);
+#endif
+        void ServerRead(ClientNetObject type, NetBuffer msg, Client c);        
+    }
+
+    /// <summary>
+    /// Interface for entities that the server can send information of to the clients
+    /// </summary>
+    interface IServerSerializable : INetSerializable
+    {
+        void ServerWrite(NetBuffer msg, Client c, object[] extraData = null);
+#if CLIENT
+        void ClientRead(ServerNetObject type, NetBuffer msg, float sendingTime);
+#endif
+    }
+}