Add Lua standard library and supporting C#/yaml

OpenRA.Mods.RA/Activities/Hunt.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2013 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. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System.Collections.Generic;
+using System.Linq;
+using OpenRA.Mods.RA.Buildings;
+using OpenRA.Mods.RA.Move;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA.Activities
+{
+	public class Hunt : Activity
+	{
+		readonly IEnumerable<Actor> targets;
+
+		public Hunt(Actor self)
+		{
+			var attack = self.Trait<AttackBase>();
+			targets = self.World.Actors.Where(a => self != a && !a.IsDead() && a.IsInWorld && a.AppearsHostileTo(self)
+				&& a.HasTrait<Huntable>() && attack.HasAnyValidWeapons(Target.FromActor(a)));
+		}
+
+		public override Activity Tick(Actor self)
+		{
+			if (IsCanceled)
+				return NextActivity;
+			
+			var target = targets.ClosestTo(self);
+			if (target == null)
+				return this;
+
+			return Util.SequenceActivities(
+				new AttackMove.AttackMoveActivity(self, new Move.Move(target.Location, WRange.FromCells(2))),
+				new Wait(25),
+				this);
+		}
+	}
+
+	public class HuntableInfo : TraitInfo<Huntable> { }
+	public class Huntable { }
+}