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/RemoveMobileOnRails.cs

@@ -0,0 +1,45 @@
+#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;
+using OpenRA.Mods.Common.UpdateRules;
+
+namespace OpenRA.Mods.Common.UpdateRules.Rules
+{
+	public class RemoveMobileOnRails : UpdateRule
+	{
+		public override string Name { get { return "Notify Mobile.OnRails removal"; } }
+		public override string Description
+		{
+			get
+			{
+				return "The OnRails parameter on Mobile has been removed.\n" +
+					"Actors that want to duplicate the left-right movement of the original Tiberian Dawn gunboat\n" +
+					"should replace the Mobile and AttackTurreted traits with TDGunboat and AttackTDGunboatTurreted.";
+			}
+		}
+
+		public override IEnumerable<string> UpdateActorNode(ModData modData, MiniYamlNode actorNode)
+		{
+			var removedOnRails = actorNode.ChildrenMatching("Mobile")
+				.Sum(m => m.Value.Nodes.RemoveAll(n => n.Key == "OnRails"));
+
+			if (removedOnRails == 0)
+				yield break;
+
+			yield return "Mobile.OnRails is no longer supported for actor type {0}.\n".F(actorNode.Key)
+				+ "If you want to duplicate the left-right movement of the original Tiberian Dawn gunboat\n"
+				+ "you must manually replace Mobile with the new TDGunboat trait, and AttackTurreted with AttackTDGunboatTurreted.";
+		}
+	}
+}