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/NotComponent.cs

@@ -0,0 +1,19 @@
+using System.Xml.Linq;
+
+namespace Barotrauma.Items.Components
+{
+    class NotComponent : ItemComponent
+    {
+        public NotComponent(Item item, XElement element)
+            : base (item, element)
+        {
+        }
+        
+        public override void ReceiveSignal(int stepsTaken, string signal, Connection connection, Item source, Character sender, float power=0.0f)
+        {
+            if (connection.Name != "signal_in") return;
+            
+            item.SendSignal(stepsTaken, signal=="0" ? "1" : "0", "signal_out", sender);
+        }
+    }
+}