BannerUtil 
快速创建旗帜物品堆叠的方式。
示例:
public static final ItemStack FROST = BannerUtil.create("translationKey", Items.CYAN_BANNER,
new Pair<>(BannerPatterns.CROSS, DyeColor.WHITE),
new Pair<>(BannerPatterns.STRAIGHT_CROSS, DyeColor.WHITE),
new Pair<>(BannerPatterns.CURLY_BORDER, DyeColor.WHITE),
new Pair<>(BannerPatterns.FLOWER, DyeColor.LIGHT_BLUE));