更新进制转换功能

("Url编码", 1), ("Url解码", 2), ("Base64编码", 3), ("Base64解码", 4), ("Unicode编码", 5), ("Unicode解码", 6),("Html编码", 7), ("Html解码", 8), ("字母全小写", 9), ("字母全大写", 10), ("十转十六进制", 11),
("十六转十进制", 12), ("字符转十六进制", 13), ("十六进制转字符", 14), ("MD5加密", 15), ("文本去重", 16),
("JSON格式化", 17), ("Unix时间戳转换", 18), ("生成二维码", 19)