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/FrameCounter.cs

@@ -0,0 +1,46 @@
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Barotrauma
+{
+        public class FrameCounter
+        {
+            public long TotalFrames { get; private set; }
+            public double TotalSeconds { get; private set; }
+            public double AverageFramesPerSecond { get; private set; }
+            public double CurrentFramesPerSecond { get; private set; }
+
+            public const int MaximumSamples = 10;
+
+            private Queue<double> sampleBuffer = new Queue<double>();
+
+            public bool Update(double deltaTime)
+            {
+                //float deltaTime = stopwatch.ElapsedMilliseconds / 1000.0f;
+
+                if (deltaTime == 0.0f) { return false; }
+                //stopwatch.Restart();
+
+                CurrentFramesPerSecond = (1.0 / deltaTime);
+
+                sampleBuffer.Enqueue(CurrentFramesPerSecond);
+
+                if (sampleBuffer.Count > MaximumSamples)
+                {
+                    sampleBuffer.Dequeue();
+                    AverageFramesPerSecond = sampleBuffer.Average(i => i);
+                }
+                else
+                {
+                    AverageFramesPerSecond = CurrentFramesPerSecond;
+                }
+
+                if (AverageFramesPerSecond < 0 || AverageFramesPerSecond > 500) { }
+                  
+                TotalFrames++;
+                TotalSeconds += deltaTime;
+                return true;
+            }
+        }
+    
+}