Auto detect CSV delimiter

[zufuliu]

          是否有命令行可以指定分隔符？目前用 `/s csv` 参数只能以默认的 `,` 分隔，我想对某一类文件直接启用 `|` 分隔。

Originally posted by @Mapaler in #453 (comment)

[Mapaler]

建议增加一个自定义字符串参数，任何其他参数的附加功能都可以从这里面调用，比如
It is recommended to add a custom string parameter, from which additional functions of any other parameter can be called, for example
/s csv /option "{split:|,quote:\"}"
或者是给/s参数的内容增加一个分隔符，参数写在分隔符后面，比如
Or add a delimiter to the content of the /s parameter, and write the parameter after the delimiter, for example
/s "csv|{split:\|,quote:\"}"

[zufuliu]

建议增加一个自定义字符串参数

I'm planning to auto detect the delimiter with a naive method:
https://github.com/zufuliu/notepad4-test/blob/main/script/Issue892.py

The result is good after test CSV files from https://github.com/ws-garcia/CSVsniffer

[zufuliu]

Implemented by 4243079, please test latest build from https://github.com/zufuliu/notepad4/actions