anchor.diff:  typedef Feature FeatureLoadHandler(World world, Tile tile, Map<String, Object> json);
   Map<String, FeatureLoadHandler> featureLoadHandlers = {
   	"FeatureTrees": FeatureTrees.loadClass,
  +	"FeatureSaplings": FeatureSaplings.loadClass,
   	"FeatureHut": FeatureHut.loadClass,
   	"FeatureCraftingTable": FeatureCraftingTable.loadClass,
   	"FeatureFurnace": FeatureFurnace.loadClass,
  
positive.code: 	}
  }
  
  class RecipeTrees extends FeatureRecipe {
  	RecipeTrees() {
  		name = "Plant Trees";
  
negative.code: 		TreeBreed breed = (items[0].item as ItemSapling).breed;
  		
  		for (Feature f in tile.features) {
  			if (f is FeatureSaplings && (f as FeatureSaplings).breed == breed) {
  				(f as FeatureSaplings).numTrees += 4;
  				f.space += 4;
  				return null;
  			}
  		}
  		
  		return new FeatureSaplings(tile, breed, 4);
  	}
  	
  	@override
  