[feature request] add an option to exclude specified file from string matches

[uprprc777]

Currently, RHash only has an option --exclude to exclude some files with certain extensions. However, it would be useful to have another option to exclude specified file from string matches, similar to WinRAR's -X switches.
This is especially useful when "-r" is enabled.

In RAR, "*" and "/" can also be used to exclude certain files, directories (their contents), and paths flexibly.

This website provides a copy of the "-X" section of the WinRAR Manual, although it's not WinRAR's official website.