code: public <T> T getConfig(Supplier<? extends ConfigBuilder<? extends T>> constructor) {
          return constructor.get()
                            .rebase(this.properties)
                            .build();
      }
docs: Gets a new instance of a Configuration for this builder.
  
  @param constructor A Supplier for a ConfigBuilder for the given Configuration.
  @param <T>         The type of the Configuration to instantiate.
  @return The new instance of a Configuration for this builder.