generalized that hack into something that's probably useful

OpenRa.Game/Effects/DelayedAction.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using OpenRa.Game.Traits;
+
+namespace OpenRa.Game.Effects
+{
+	class DelayedAction : IEffect
+	{
+		Action a;
+		int delay;
+
+		public DelayedAction(int delay, Action a)
+		{
+			this.a = a;
+			this.delay = delay;
+		}
+
+		public void Tick()
+		{
+			if (--delay <= 0)
+				Game.world.AddFrameEndTask(w => { w.Remove(this); a(); });
+		}
+
+		public IEnumerable<Renderable> Render() { yield break; }
+	}
+}