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/Utils/FeatureLevelTest.cs

@@ -0,0 +1,68 @@
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+using System;
+
+namespace FSO.Common.Utils
+{
+    public class FeatureLevelTest
+    {
+        public static bool UpdateFeatureLevel(GraphicsDevice gd)
+        {
+            //if 3d is enabled, check if we support non-power-of-two mipmaps
+            if (FSOEnvironment.SoftwareKeyboard && FSOEnvironment.SoftwareDepth)
+            {
+                FSOEnvironment.EnableNPOTMip = false;
+                return true;
+            }
+            try
+            {
+                using (var mipTest = new Texture2D(gd, 11, 11, true, SurfaceFormat.Color))
+                {
+                    var data = new Color[11 * 11];
+                    TextureUtils.UploadWithMips(mipTest, gd, data);
+                }
+            }
+            catch (Exception e)
+            {
+                FSOEnvironment.EnableNPOTMip = false;
+            }
+
+            try
+            {
+                using (var mipTest = new Texture2D(gd, 4, 4, true, SurfaceFormat.Dxt5))
+                {
+                    var data = new byte[16];
+                    mipTest.SetData(data);
+                }
+            }
+            catch (Exception e)
+            {
+                FSOEnvironment.TexCompressSupport = false;
+            }
+
+            //msaa test
+            try
+            {
+                var msaaTarg = new RenderTarget2D(gd, 1, 1, false, SurfaceFormat.Color, DepthFormat.None, 8, RenderTargetUsage.PreserveContents);
+                gd.SetRenderTarget(msaaTarg);
+                gd.Clear(Color.Red);
+
+                var tex = TextureUtils.CopyAccelerated(gd, msaaTarg);
+
+                var result = new Color[1];
+                tex.GetData(result);
+                FSOEnvironment.MSAASupport = result[0] == Color.Red;
+                gd.SetRenderTarget(null);
+                msaaTarg.Dispose();
+                tex.Dispose();
+            }
+            catch
+            {
+                gd.SetRenderTarget(null);
+                FSOEnvironment.MSAASupport = false;
+            }
+
+            return true;
+        }
+    }
+}