drastically simplify generator API

common/addons/config-biome/src/main/java/com/dfsek/terra/addons/biome/command/biome/arg/BiomeArgumentParser.java

@@ -22,6 +22,6 @@ public class BiomeArgumentParser implements ArgumentParser<TerraBiome> {
     @Override
     public TerraBiome parse(CommandSender sender, String arg) {
         Player player = (Player) sender;
-        return player.world().getConfig().getRegistry(TerraBiome.class).get(arg).orElse(null);
+        return player.world().getPack().getRegistry(TerraBiome.class).get(arg).orElse(null);
     }
 }

common/addons/config-biome/src/main/java/com/dfsek/terra/addons/biome/command/biome/tab/BiomeTabCompleter.java

@@ -25,7 +25,7 @@ public class BiomeTabCompleter implements TabCompleter {
     @Override
     public List<String> complete(CommandSender sender) {
         Player player = (Player) sender;
-        return player.world().getConfig().getRegistry(TerraBiome.class).entries().stream().map(TerraBiome::getID).collect(
+        return player.world().getPack().getRegistry(TerraBiome.class).entries().stream().map(TerraBiome::getID).collect(
                 Collectors.toList());
     }
 }