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/Utils/MathUtils.cs

@@ -0,0 +1,22 @@
+using Microsoft.Xna.Framework;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Barotrauma
+{
+    class CompareSegmentPointCW : IComparer<Lights.SegmentPoint>
+    {
+        private Vector2 center;
+
+        public CompareSegmentPointCW(Vector2 center)
+        {
+            this.center = center;
+        }
+        public int Compare(Lights.SegmentPoint a, Lights.SegmentPoint b)
+        {
+            return -CompareCCW.Compare(a.WorldPos, b.WorldPos, center);
+        }
+    }
+}