Discrepancies in rust vs. C# detection

[nguerrera]

1. Rust does not allow JQQJ9D or JQQJ9H in HISv2 pattern. (There is discussion going on elsewhere about this all up.)

2. Rust allows all plain base64 and base64url alphabet chars for all HISv1 patterns while C# has individualized alphabets that are base62, base64, or base64url for different patterns.

3. Rust always considers == padding optional in many cases where C# patterns have it required to match.

[nguerrera]

Looking at the rust code that manually matches these patterns post signature-find, it's very uniform and it might not be very hard to generate it from the c# regexes.