Add an EditorTilesetFilter trait for filtering the actor palette based on tileset.

OpenRA.Game/Traits/EditorTilesetFilter.cs

@@ -0,0 +1,20 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2011 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
+
+namespace OpenRA.Traits
+{
+	public class EditorTilesetFilterInfo : TraitInfo<EditorTilesetFilter>
+	{
+		public readonly string[] RequireTilesets = null;
+		public readonly string[] ExcludeTilesets = null;
+	}
+
+	public class EditorTilesetFilter { }
+}