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/BarotraumaClient/Source/Networking/NetEntityEvent/NetEntityEvent.cs

@@ -0,0 +1,24 @@
+using Lidgren.Network;
+using System;
+
+namespace Barotrauma.Networking
+{
+    class ClientEntityEvent : NetEntityEvent
+    {
+        private IClientSerializable serializable;
+
+        public UInt16 CharacterStateID;
+
+        public ClientEntityEvent(IClientSerializable entity, UInt16 id)
+            : base(entity, id)
+        {
+            serializable = entity;
+        }
+
+        public void Write(NetBuffer msg)
+        {
+            msg.Write(CharacterStateID);
+            serializable.ClientWrite(msg, Data);
+        }
+    }
+}