Second implementation of Sandworms

Fix tabs in AttackSwallow.cs

OpenRA.Mods.RA/Attack/AttackWander.cs

@@ -33,6 +33,7 @@ namespace OpenRA.Mods.RA
 		public void TickIdle(Actor self)
 		{
 			var target = self.CenterPosition + new WVec(0, -1024*Info.MoveRadius, 0).Rotate(WRot.FromFacing(self.World.SharedRandom.Next(255)));
+			// TODO: This needs to be looked into again. The bigger MoveRadius is, the bigger chance that the selected coordinates will be invalid.
 			self.Trait<AttackMove>().ResolveOrder(self, new Order("AttackMove", self, false) { TargetLocation = self.World.Map.CellContaining(target) });
 		}
 	}