Removed NioTSO client and server

- NioTSO client isn't needed because we're using RayLib
- Added FreeSO's API server to handle most backend operations

server/tso.common/Rendering/Framework/3DLayer.cs

@@ -0,0 +1,99 @@
+using System;
+using System.Collections.Generic;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace FSO.Common.Rendering.Framework
+{
+    public class _3DLayer : IGraphicsLayer
+    {
+        public GraphicsDevice Device;
+        public List<_3DAbstract> Scenes = new List<_3DAbstract>();
+        public List<_3DAbstract> External = new List<_3DAbstract>();
+
+        #region IGraphicsLayer Members
+
+        public void Update(FSO.Common.Rendering.Framework.Model.UpdateState state)
+        {
+            foreach (var scene in Scenes)
+            {
+                scene.Update(state);
+            }
+            foreach (var scene in External)
+            {
+                scene.Update(state);
+            }
+        }
+
+        public void PreDraw(Microsoft.Xna.Framework.Graphics.GraphicsDevice device)
+        {
+            foreach (var scene in Scenes)
+            {
+                if (scene.Visible) scene.PreDraw(device);
+            }
+        }
+
+        public void Draw(Microsoft.Xna.Framework.Graphics.GraphicsDevice device)
+        {
+            foreach (var scene in Scenes)
+            {
+                if (scene.Visible) scene.Draw(device);
+            }
+        }
+
+        public void Initialize(Microsoft.Xna.Framework.Graphics.GraphicsDevice device)
+        {
+            this.Device = device;
+            foreach (var scene in Scenes)
+            {
+                scene.Initialize(this);
+            }
+            foreach (var scene in External)
+            {
+                scene.Initialize(this);
+            }
+        }
+
+        public void Add(_3DAbstract scene)
+        {
+            Scenes.Add(scene);
+            if (this.Device != null)
+            {
+                scene.Initialize(this);
+            }
+        }
+
+        public void Remove(_3DAbstract scene)
+        {
+            Scenes.Remove(scene);
+        }
+
+        public void Clear()
+        {
+            foreach (var scene in Scenes)
+            {
+                if (scene is IDisposable) ((IDisposable)scene).Dispose();
+            }
+            Scenes.Clear();
+        }
+
+        /// <summary>
+        /// Adds a scene to the draw stack. The system will not call
+        /// Draw on the scene but it will be initialized and given updates
+        /// </summary>
+        /// <param name="scene"></param>
+        public void AddExternal(_3DAbstract scene){
+            External.Add(scene);
+            if (this.Device != null)
+            {
+                scene.Initialize(this);
+            }
+        }
+
+        public void RemoveExternal(_3DAbstract scene)
+        {
+            External.Remove(scene);
+        }
+
+        #endregion
+    }
+}