SpawnMapActors trait on world actor is now responsible for spawning trees etc at gamestart time

OpenRA.Game/Traits/World/SpawnMapActors.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace OpenRA.Traits
+{
+	class SpawnMapActorsInfo : StatelessTraitInfo<SpawnMapActors> { }
+
+	class SpawnMapActors : IGameStarted
+	{
+		public void GameStarted(World world)
+		{
+			Game.skipMakeAnims = true;		// rude hack
+
+			foreach (var actorReference in world.Map.Actors)
+				world.CreateActor(actorReference.Name, actorReference.Location,
+					world.players.Values.FirstOrDefault(p => p.InternalName == actorReference.Owner)
+					?? world.NeutralPlayer);
+
+			Game.skipMakeAnims = false;
+		}
+	}
+}