Split off the upgrade rules of the previous release cycle.

OpenRA.Mods.Common/UpdateRules/Rules/20180307/DefineOwnerLostAction.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.Collections.Generic;
+using System.Linq;
+
+namespace OpenRA.Mods.Common.UpdateRules.Rules
+{
+	public class DefineOwnerLostAction : UpdateRule
+	{
+		public override string Name { get { return "Add OwnerLostAction to player-controlled actors"; } }
+		public override string Description
+		{
+			get
+			{
+				return "A new OwnerLostAction trait has been introduced to control what happens to a\n" +
+				"player's actors when they are defeated. A warning is displayed notifying that\nthis trait must be added to actors.";
+			}
+		}
+
+		bool reported;
+		public override IEnumerable<string> AfterUpdate(ModData modData)
+		{
+			if (!reported)
+				yield return "All player-controlled (or player-capturable) actors should define an OwnerLostAction trait\n" +
+					"specifying an action (Kill, Dispose, ChangeOwner) to apply when the actor's owner is defeated.\n" +
+					"You must manually define this trait on the appropriate default actor templates.\n" +
+					"Actors missing this trait will remain controllable by their owner after they have been defeated.";
+
+			reported = true;
+		}
+
+		public override IEnumerable<string> UpdateActorNode(ModData modData, MiniYamlNode actorNode)
+		{
+			yield break;
+		}
+	}
+}