Deduplicate directional support powers.

OpenRA.Mods.Common/Traits/SupportPowers/DirectionalSupportPower.cs

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+#region Copyright & License Information
+/*
+ * Copyright (c) The OpenRA Developers and Contributors
+ * 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 OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	public abstract class DirectionalSupportPowerInfo : SupportPowerInfo
+	{
+		[Desc("Enables the player directional targeting")]
+		public readonly bool UseDirectionalTarget = false;
+
+		[SequenceReference(nameof(DirectionArrowAnimation), allowNullImage: true)]
+		public readonly string[] Arrows = { "arrow-t", "arrow-tl", "arrow-l", "arrow-bl", "arrow-b", "arrow-br", "arrow-r", "arrow-tr" };
+
+		[Desc("Animation used to render the direction arrows.")]
+		public readonly string DirectionArrowAnimation = null;
+
+		[PaletteReference]
+		[Desc("Palette for direction cursor animation.")]
+		public readonly string DirectionArrowPalette = "chrome";
+	}
+
+	public class DirectionalSupportPower : SupportPower
+	{
+		readonly DirectionalSupportPowerInfo info;
+
+		public DirectionalSupportPower(Actor self, DirectionalSupportPowerInfo info)
+			: base(self, info)
+		{
+			this.info = info;
+		}
+
+		public override void SelectTarget(Actor self, string order, SupportPowerManager manager)
+		{
+			if (info.UseDirectionalTarget)
+				self.World.OrderGenerator = new SelectDirectionalTarget(self.World, order, manager, info);
+			else
+				base.SelectTarget(self, order, manager);
+		}
+	}
+}