Finish theif logic. TODO: Determine amount to steal

OpenRa.Game/Traits/Activities/Steal.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace OpenRa.Game.Traits.Activities
+{
+	class Steal : IActivity
+	{
+		Actor target;
+		
+		public Steal(Actor target) { this.target = target; }
+
+		public IActivity NextActivity { get; set; }
+
+		public IActivity Tick(Actor self)
+		{
+			if (target == null || target.IsDead) return NextActivity;
+			if (target.Owner == self.Owner) return NextActivity;
+			
+			foreach (var t in target.traits.WithInterface<IAcceptThief>())
+				t.OnSteal(target, self);
+			
+			return NextActivity;
+		}
+
+		public void Cancel(Actor self) { target = null; NextActivity = null; }
+	}
+}