Refactor generics

[cmccomb]

Standardize the interface to minimize generic use. Currently captures and repetitions use a generic (T: Into<String> + fmt::Display) which allows str, String, and HumanRegex as inputs. However, standardizing towards HumanRegex inputs only would enable more consistent usage - all raw text inputs would have to pass through the text or direct_regex functions, which would ensure more consistent escaping of special characters.

[m-kuzmin]

Wouldnt it be better to return unit types that implement Into<HumanRegexEnum>, where HumanRegexEnum has all the unit types like this:

pub struct Ascii;
pub struct Hex;
// ...

pub enum HumanRegexEnum {
    Ascii,
    Hex,
    // ...
}

This also allows to implement #7.

[cmccomb]

Great suggestion, I'll look into this too. Thanks for your interest!

[m-kuzmin]

Just remebered that you can use types from regex-syntax.