Implement new mod/map updater framework.

OpenRA.Mods.Common/UpdateRules/UpdateRule.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2018 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.Collections.Generic;
+using System.Linq;
+
+namespace OpenRA.Mods.Common.UpdateRules
+{
+	public abstract class UpdateRule
+	{
+		public abstract string Name { get; }
+		public abstract string Description { get; }
+
+		/// <summary>Defines a transformation that is run on each top-level node in a yaml file set.</summary>
+		/// <returns>An enumerable of manual steps to be run by the user</returns>
+		public delegate IEnumerable<string> TopLevelNodeTransform(ModData modData, MiniYamlNode node);
+
+		public virtual IEnumerable<string> UpdateActorNode(ModData modData, MiniYamlNode actorNode) { yield break; }
+		public virtual IEnumerable<string> UpdateWeaponNode(ModData modData, MiniYamlNode weaponNode) { yield break; }
+		public virtual IEnumerable<string> UpdateTilesetNode(ModData modData, MiniYamlNode tilesetNode) { yield break; }
+
+		public virtual IEnumerable<string> BeforeUpdate(ModData modData) { yield break; }
+		public virtual IEnumerable<string> AfterUpdate(ModData modData) { yield break; }
+	}
+}