Determines whether a given text-based value is printable

Printable example

    use is_printable::IsPrintable;

    let hello = "hello";
    let is_printable = hello.is_printable();

    assert_eq!(is_printable, true);

Unprintable example

    use is_printable::IsPrintable;

    let bell = '\u{7}'
    let is_printable = bell.is_printable();

    assert_eq!(is_printable, false);