HslStructAttribute 属性

编码信息，如果是字符串类型，则表示字符串的编码信息，可选 ASCII UNICODE UTF8 GB2312 ANSI BIG-UNICODE
Encoding information. If it is a string, it indicates the encoding information of a string. The option is ASCII UNICODE UTF8 GB2312 ANSI BIG-UNICODE

字节偏移字节信息，如果是bool，就是位偏移地址，按照位为单位
Byte offset Indicates the byte information. If the value is bool, it is the address of the bit offset. The unit is bits

长度信息，如果是普通类型，则表示数组，如果是字符串，则表示字符串占用的最大字节长度
Length information, if a common type, represents an array, if a string, represents the maximum length of bytes taken by the string

字符串的解析模式，0：默认没有字节头 1: 一个头子节，表示长度，2: 两个头子节，最大字符数和实际字符数，3: 两个字节头，实际字符数，4: 四个头字节，最大字符数和实际字符数，5: 四个头字节，字符串实际长度
Parsing mode of the string, 0: default byte header 1: one head section, indicating the length, 2: two head sections, maximum number of characters and actual number of characters, 3: two head bytes, actual number of characters, 4: four head bytes, maximum number of characters and actual number of characters, 5: four head bytes, actual length of the string

When implemented in a derived class, gets a unique identifier for this Attribute.