Implemented Floating Text and radar video

OpenRA.Game/Effects/AsyncAction.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2015 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;
+using System.Collections.Generic;
+using OpenRA.Graphics;
+
+namespace OpenRA.Effects
+{
+	public class AsyncAction : IEffect
+	{
+		Action a;
+		IAsyncResult ar;
+
+		public AsyncAction(IAsyncResult ar, Action a)
+		{
+			this.a = a;
+			this.ar = ar;
+		}
+
+		public void Tick(World world)
+		{
+			if (ar.IsCompleted)
+			{
+				world.AddFrameEndTask(w => { w.Remove(this); a(); });
+			}
+		}
+
+		public IEnumerable<IRenderable> Render(WorldRenderer r) { yield break; }
+	}
+}