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/3DTargetScene.cs

@@ -0,0 +1,44 @@
+using FSO.Common.Rendering.Framework.Camera;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace FSO.Common.Rendering.Framework
+{
+    public class _3DTargetScene : _3DScene
+    {
+        public RenderTarget2D Target;
+        private GraphicsDevice Device;
+        private int Multisample = 0;
+        public Color ClearColor = Color.Transparent;
+        public _3DTargetScene(GraphicsDevice device, ICamera camera, Point size, int multisample) : this(device, size, multisample) { Camera = camera; }
+        public _3DTargetScene(GraphicsDevice device, Point size, int multisample) : base(device)
+        {
+            Device = device;
+            Multisample = multisample;
+            SetSize(size);
+        }
+
+        public void SetSize(Point size)
+        {
+            if (Target != null) Target.Dispose();
+            Target = new RenderTarget2D(Device, size.X, size.Y, false, SurfaceFormat.Color, DepthFormat.Depth24Stencil8, Multisample, RenderTargetUsage.PreserveContents);
+        }
+
+        public override void Draw(GraphicsDevice device)
+        {
+            var oldTargets = device.GetRenderTargets();
+            device.SetRenderTarget(Target);
+            device.Clear(ClearColor);
+            device.DepthStencilState = DepthStencilState.Default;
+            Camera.ProjectionDirty();
+            base.Draw(device);
+            device.SetRenderTargets(oldTargets);
+        }
+
+        public override void Dispose()
+        {
+            base.Dispose();
+            Target.Dispose();
+        }
+    }
+}