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/SharpFont/Source/SharpFontShared/Internal/NativeObject.cs

@@ -0,0 +1,33 @@
+using System;
+
+namespace SharpFont
+{
+	/// <summary>
+	/// Provide a consistent means for using pointers as references.
+	/// </summary>
+	public abstract class NativeObject
+	{
+		private IntPtr reference;
+
+		/// <summary>
+		/// Construct a new NativeObject and assign the reference.
+		/// </summary>
+		/// <param name="reference"></param>
+		protected NativeObject(IntPtr reference)
+		{
+			this.reference = reference;
+		}
+
+		internal virtual IntPtr Reference
+		{
+			get
+			{
+				return reference;
+			}
+			set
+			{
+				reference = value;
+			}
+		}
+	}
+}