ZipWriter with AES password &[u8]

[nganhkhoa]

While ZipArchive allows decryption of AES passwords from bytes, ZipWriter with FileOptions only allows for &str password. This behavior is inconsistent, and incomplete. Zip files can be protected using bytes, not only readable (&str) password.

The current implementation already allows for encryption using bytes, we only need to change the interface for FileOptions.

[nganhkhoa]

The current implementation also adds an unnecessary unsafe to the code through the use of unsafe std::str::from_utf8_unchecked to convert from arbitrary bytes to &str. Not sure if there's any other way around, but support for &[u8] or AsRef<[u8]> is highly recommended.