add PlayerPaletteFromCurrentTileset and desert tileset for RA

some things left to do:
ore, walls and silo/hbox need some work

OpenRA.Mods.RA/PlayerPaletteFromCurrentTileset.cs

@@ -0,0 +1,41 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2012 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 COPYING.
+ */
+#endregion
+
+using OpenRA.FileFormats;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA
+{
+	class PlayerPaletteFromCurrentTilesetInfo : ITraitInfo
+	{
+		public readonly string Name = null;
+		public readonly int[] ShadowIndex = { };
+
+		public object Create(ActorInitializer init) { return new PlayerPaletteFromCurrentTileset(init.world, this); }
+	}
+
+	class PlayerPaletteFromCurrentTileset : IPalette
+	{
+		readonly World world;
+		readonly PlayerPaletteFromCurrentTilesetInfo info;
+
+		public PlayerPaletteFromCurrentTileset(World world, PlayerPaletteFromCurrentTilesetInfo info)
+		{
+			this.world = world;
+			this.info = info;
+		}
+
+		public void InitPalette (OpenRA.Graphics.WorldRenderer wr)
+		{
+			string Filename = world.TileSet.PlayerPalette == null ? world.TileSet.Palette : world.TileSet.PlayerPalette;
+			wr.AddPalette(info.Name, new Palette(FileSystem.Open(Filename), info.ShadowIndex));
+		}
+	}
+}