Add bitmap export to palette (for debugging).

OpenRA.FileFormats/Palette.cs

@@ -100,6 +100,21 @@ namespace OpenRA.FileFormats
 			return pal;
 		}
 
+		public Bitmap AsBitmap()
+        {
+            var b = new Bitmap(256, 1, PixelFormat.Format32bppArgb);
+            var data = b.LockBits(new Rectangle(0, 0, b.Width, b.Height),
+			                      ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
+            unsafe
+            {
+                uint* c = (uint*)data.Scan0;
+                for (var x = 0; x < 256; x++)
+	                *(c + x) = colors[x];
+            }
+            b.UnlockBits(data);
+			return b;
+        }
+
 		public static Palette Load(string filename, int[] remap)
 		{
 			using(var s = File.OpenRead(filename))