finished TraitDictionary. Refactored permanent actor-removal.

OpenRA.Game/Traits/Activities/RemoveSelf.cs

@@ -18,7 +18,7 @@ namespace OpenRA.Traits.Activities
 		public IActivity Tick(Actor self)
 		{
 			if (isCanceled) return NextActivity;
-			self.World.AddFrameEndTask(w => w.Remove(self));
+			self.Destroy();
 			return null;
 		}
 

OpenRA.Game/Traits/Activities/Sell.cs

@@ -30,7 +30,7 @@ namespace OpenRA.Traits.Activities
 			
 			foreach (var ns in self.TraitsImplementing<INotifySold>())
 				ns.Sold(self);
-			self.World.AddFrameEndTask( _ => self.World.Remove( self ) );
+			self.Destroy();
 		}
 
 		public IActivity Tick(Actor self)