Move 20171014-20180218 update rules to subfolder

Also synced order of appearance with order they're applied in when running the full update path.

OpenRA.Mods.Common/UpdateRules/Rules/20171014/ChangeBuildableArea.cs

@@ -0,0 +1,51 @@
+#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.Collections.Generic;
+
+namespace OpenRA.Mods.Common.UpdateRules.Rules
+{
+	public class ChangeBuildableArea : UpdateRule
+	{
+		public override string Name { get { return "Require 'AreaTypes' on 'GivesBuildableArea'"; } }
+		public override string Description
+		{
+			get
+			{
+				return "'AreaTypes' are now mandatory on 'GivesBuildableArea'.\n" +
+				"A 'RequiresBuildableArea' trait was added and 'Building.Adjacent' was moved there.";
+			}
+		}
+
+		public override IEnumerable<string> UpdateActorNode(ModData modData, MiniYamlNode actorNode)
+		{
+			var givesBuildableArea = actorNode.LastChildMatching("GivesBuildableArea");
+			if (givesBuildableArea != null)
+				givesBuildableArea.AddNode("AreaTypes", "building");
+
+			var building = actorNode.LastChildMatching("Building");
+			if (building != null)
+			{
+				var requiresBuildableArea = new MiniYamlNode("RequiresBuildableArea", "");
+				requiresBuildableArea.AddNode("AreaTypes", "building");
+
+				var adjacent = building.LastChildMatching("Adjacent");
+				if (adjacent != null)
+					requiresBuildableArea.AddNode(adjacent);
+
+				actorNode.AddNode(requiresBuildableArea);
+				building.RemoveNodes("Adjacent");
+			}
+
+			yield break;
+		}
+	}
+}