libpwquality bindings for Rust

Examples

```rust use libpwquality::{Error, PWQuality, Setting};

fn main() -> Result<(), Error> { let pwq = PWQuality::new()?;

pwq.read_default_config()?;

pwq.set_int_value(Setting::MinLength, 9)?;
let minlen = pwq.get_int_value(Setting::MinLength)?;
println!("minlen={}", minlen);

pwq.set_str_value(Setting::BadWords, "badpassword")?;
let badwords = pwq.get_str_value(Setting::BadWords)?;
println!("badwords=\"{}\"", badwords);

pwq.set_option("maxrepeat=2")?;
let maxrepeat = pwq.get_int_value(Setting::MaxRepeat)?;
println!("maxrepeat={}", maxrepeat);

let password = pwq.generate(32)?;
println!("password={}", password);

let score = pwq.check("p@s5w0rD!", None, None)?;
println!("score={}", score);

let score = pwq.check("p@s5w0rD!", Some("password!"), None)?;
println!("score1={}", score);

let score = pwq.check("p@s5w0rD!", Some("password!"), Some("root"))?;
println!("score2={}", score);

Ok(())

} ```