Split NukePower MissileImage from MissileWeapon.

OpenRA.Mods.Common/UpdateRules/Rules/20201213/SplitNukePowerMissileImage.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2022 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 SplitNukePowerMissileImage : UpdateRule
+	{
+		public override string Name => "NukePower now defines the image for the missile with MissileImage.";
+
+		public override string Description =>
+			"NukePower used MissileWeapon field for as the name for missile image too.\n" +
+			"This function has been moved to its own MissileImage field.";
+
+		public override IEnumerable<string> UpdateActorNode(ModData modData, MiniYamlNode actorNode)
+		{
+			foreach (var nukePowerNode in actorNode.ChildrenMatching("NukePower"))
+			{
+				var missileWeaponNode = nukePowerNode.ChildrenMatching("MissileWeapon").FirstOrDefault();
+				if (missileWeaponNode != null)
+				{
+					var weapon = missileWeaponNode.NodeValue<string>();
+					nukePowerNode.AddNode(new MiniYamlNode("MissileImage", weapon));
+				}
+			}
+
+			yield break;
+		}
+	}
+}