[VXA]make_item_list

  def make_item_list(sort)
    # // Method to make item list.
    @data = $game_party.all_items.select { |item| include?(item) }
    case sort
    when :price_high then @data.sort_by!(&:price).reverse!
    when :price_low  then @data.sort_by!(&:price)
    when :a_z        then @data.sort_by! { |a| a.name.downcase }
    when :z_a        then @data.sort_by! { |a| a.name.downcase }.reverse!
    end
    @data.push(nil) if include?(nil)
  end