Completely rewrite miniyaml tree outputting utility commands

Rename --actor-yaml to --resolved-rules <actor name>
Implement --resolved-sequences <image name>
Implement --resolved-weapons <weapon name>

OpenRA.Mods.Common/UtilityCommands/Utilities.cs

@@ -0,0 +1,54 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2016 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System;
+using System.IO;
+using System.Linq;
+using OpenRA.FileSystem;
+
+namespace OpenRA.Mods.Common.UtilityCommands
+{
+	public static class Utilities
+	{
+		/// <exception cref="ArgumentNullException">Thrown if manifestPropertySelector is null.</exception>
+		public static MiniYamlNode GetTopLevelNodeByKey(ModData modData, string key,
+			Func<Manifest, string[]> manifestPropertySelector,
+			Func<Map, MiniYaml> mapPropertySelector = null,
+			string mapPath = null)
+		{
+			if (manifestPropertySelector == null)
+				throw new ArgumentNullException("manifestPropertySelector", "Must pass a non-null manifestPropertySelector");
+
+			Map map = null;
+			if (mapPath != null)
+			{
+				try
+				{
+					map = new Map(modData, modData.ModFiles.OpenPackage(mapPath, new Folder(".")));
+				}
+				catch (InvalidDataException ex)
+				{
+					Console.WriteLine("Could not load map '{0}' so this data does not include the map's overrides.", mapPath);
+					Console.WriteLine(ex);
+					map = null;
+				}
+			}
+
+			var manifestNodes = manifestPropertySelector.Invoke(modData.Manifest);
+			var mapProperty = map == null || mapPropertySelector == null ? null
+				: mapPropertySelector.Invoke(map);
+
+			var fs = map ?? modData.DefaultFileSystem;
+			var topLevelNodes = MiniYaml.Load(fs, manifestNodes, mapProperty);
+			return topLevelNodes.FirstOrDefault(n => n.Key == key);
+		}
+	}
+}