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/Items/Components/Signal/WaterDetector.cs

@@ -0,0 +1,18 @@
+using System.Xml.Linq;
+
+namespace Barotrauma.Items.Components
+{
+    class WaterDetector : ItemComponent
+    {
+        public WaterDetector(Item item, XElement element)
+            : base (item, element)
+        {
+            IsActive = true;
+        }
+
+        public override void Update(float deltaTime, Camera cam)
+        {
+            item.SendSignal(0, item.InWater ? "1" : "0", "signal_out", null);            
+        }
+    }
+}