Culling, rendering improvements and optimizations, block removing test.

FaceData.cs

@@ -2,22 +2,24 @@
 
 namespace Voxel
 {
-    [StructLayout(LayoutKind.Sequential, Pack = 1)]
     public struct FaceData
     {
         public Orientation Facing;
-        public uint X, Y, Z;
-        public Texture Texture;
+        public byte X, Y, Z;
+        public Textures Texture;
+        public byte LightLevel;
 
-        public uint[] Pack()
+        public byte[] Pack()
         {
-            return new uint[]
+            return new byte[]
             {
                 X,
                 Y,
                 Z,
-                (uint)Facing,
-                (uint)Texture
+                (byte)Facing,
+                (byte)Texture,
+                LightLevel,
+                0,0 // two bits empty
             };
         }
     }