rename SpriteSheetBuilder to SpriteLoader; it's dumb otherwise

OpenRA.Game/Graphics/SpriteLoader.cs

@@ -0,0 +1,37 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2010 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made 
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see LICENSE.
+ */
+#endregion
+
+using System.Linq;
+using OpenRA.FileFormats;
+
+namespace OpenRA.Graphics
+{
+	public static class SpriteLoader
+	{
+		public static void Initialize( TileSet tileset, SheetBuilder sheetBuilder )
+		{
+			exts = tileset.Extensions;
+            SheetBuilder = sheetBuilder;
+			sprites = new Cache<string, Sprite[]>( LoadSprites );
+		}
+
+        static SheetBuilder SheetBuilder;
+		static Cache<string, Sprite[]> sprites;
+		static string[] exts;
+
+		static Sprite[] LoadSprites(string filename)
+		{
+			var shp = new ShpReader(FileSystem.OpenWithExts(filename, exts));
+			return shp.Select(a => SheetBuilder.Add(a.Image, shp.Size)).ToArray();
+		}
+
+		public static Sprite[] LoadAllSprites(string filename) { return sprites[filename]; }
+	}
+}