Harvester now autoharvest when produced

OpenRA.Mods.RA/Buildable.cs

@@ -33,6 +33,9 @@ namespace OpenRA.Mods.RA
 		[Desc("Disable production when there are more than this many of this actor on the battlefield. Set to 0 to disable.")]
 		public readonly int BuildLimit = 0;
 
+		[Desc("What the unit should start doing. Warning: If this is not a harvester", "it will break if you use FindResources.")] 
+		public readonly string InitialActivity = null;
+
 		// TODO: UI fluff; doesn't belong here
 		public readonly int BuildPaletteOrder = 9999;
 	}

OpenRA.Mods.RA/Production.cs

@@ -103,6 +103,10 @@ namespace OpenRA.Mods.RA
 
 				foreach (var notify in notifyOthers)
 					notify.Trait.UnitProducedByOther(notify.Actor, self, newUnit);
+
+				var bi = newUnit.Info.Traits.GetOrDefault<BuildableInfo>();
+				if (bi != null && bi.InitialActivity != null)
+					newUnit.QueueActivity(Game.CreateObject<Activity>(bi.InitialActivity));
 			});
 		}