Removed unnecessary using directives left over from migration

Diamond/GLObject.cs

@@ -1,10 +1,5 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using NLog;
-using OpenTK.Graphics;
 
 namespace Diamond
 {

Diamond/GLWrapper.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Diagnostics;
 using OpenTK.Graphics;
 using NLog;
 

Diamond/Level/TileData.cs

@@ -1,5 +1,4 @@
 using Diamond.Buffers;
-using Newtonsoft.Json;
 using OpenTK;
 
 namespace Diamond.Level

Diamond/Mesh.cs

@@ -1,10 +1,8 @@
 using System.Collections.Generic;
-using System.Diagnostics.PerformanceData;
 using System.IO;
 using System.Linq;
 using Diamond.Buffers;
 using Diamond.Util;
-using Newtonsoft.Json;
 using OpenTK;
 using OpenTK.Graphics.OpenGL4;
 

Diamond/Shaders/Program.cs

@@ -1,8 +1,6 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
 using System.Text;
-using Diamond.Buffers;
 using NLog;
 using OpenTK.Graphics.OpenGL4;
 

Diamond/Shaders/Shader.cs

@@ -1,5 +1,4 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.IO;
 using System.Text;
 using NLog;

hexworld/Driver.cs

@@ -1,7 +1,4 @@
-using System;
-using Newtonsoft.Json;
-
-namespace hexworld
+namespace hexworld
 {
     public class Driver
     {

hexworld/HexRender.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Drawing;
 using System.IO;
 using System.Linq;
 using Diamond;