destructible trees for both CnC and RA mod

- move DeadBuildingState to OpenRA.Mods.RA
- don't loop sequences with length > 1

OpenRA.Mods.RA/Buildings/DeadBuildingState.cs

@@ -0,0 +1,50 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2011 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 OpenRA.Effects;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Cnc
+{
+	class DeadBuildingStateInfo : ITraitInfo, Requires<HealthInfo>, Requires<RenderSimpleInfo>
+	{
+		public readonly int LingerTime = 20;
+
+		public object Create(ActorInitializer init) { return new DeadBuildingState(init.self, this); }
+	}
+
+	class DeadBuildingState : INotifyKilled
+	{
+		DeadBuildingStateInfo info;
+		RenderSimple rs;
+
+		public DeadBuildingState(Actor self, DeadBuildingStateInfo info)
+		{
+			this.info = info;
+			rs = self.Trait<RenderSimple>();
+			self.Trait<Health>().RemoveOnDeath = !rs.anim.HasSequence("dead");
+		}
+
+		public void Killed(Actor self, AttackInfo e)
+		{
+			if (!rs.anim.HasSequence("dead")) return;
+			
+			if (rs.anim.GetSequence("dead").Length > 1)
+				rs.anim.Play("dead");
+			else
+				rs.anim.PlayRepeating("dead");
+			
+			self.World.AddFrameEndTask(
+				w => w.Add(
+					new DelayedAction(info.LingerTime,
+						() => self.Destroy())));
+		}
+	}
+}