Introduce a new CarryableHarvester trait

OpenRA.Mods.Common/Traits/CarryableHarvester.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;
+using System.Linq;
+using OpenRA.Activities;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	public class CarryableHarvesterInfo : ITraitInfo
+	{
+		public object Create(ActorInitializer init) { return new CarryableHarvester(); }
+	}
+
+	public class CarryableHarvester : INotifyCreated, INotifyHarvesterAction
+	{
+		ICallForTransport[] transports;
+
+		void INotifyCreated.Created(Actor self)
+		{
+			transports = self.TraitsImplementing<ICallForTransport>().ToArray();
+		}
+
+		void INotifyHarvesterAction.MovingToResources(Actor self, CPos targetCell, Activity next)
+		{
+			foreach (var t in transports)
+				t.RequestTransport(self, targetCell, next);
+		}
+
+		void INotifyHarvesterAction.MovingToRefinery(Actor self, Actor refineryActor, Activity next)
+		{
+			var iao = refineryActor.Trait<IAcceptResources>();
+			var location = refineryActor.Location + iao.DeliveryOffset;
+			foreach (var t in transports)
+				t.RequestTransport(self, location, next);
+		}
+
+		void INotifyHarvesterAction.MovementCancelled(Actor self)
+		{
+			foreach (var t in transports)
+				t.MovementCancelled(self);
+		}
+
+		void INotifyHarvesterAction.Harvested(Actor self, ResourceType resource) { }
+		void INotifyHarvesterAction.Docked() { }
+		void INotifyHarvesterAction.Undocked() { }
+	}
+}