Be able to use different hash formats

Seeing as some algorithms encode the password hashes in different ways, it might be a good idea to add functionality to dictate how the hash will be output (`hashPassword`) and/or how it will be read (`checkPassword`).

This will make the interoperability better between different programs/other languages, and thus make it easier for someone to switch to Haskell, or use Haskell to operate on already existing password hashes.

[Here's a list of examples of different formats](https://hashcat.net/wiki/doku.php?id=example_hashes)