[frontend] Adding the use of Argon2id for password hashing

[AlexandreDoneux]

Related to issue #358

This pull request contains changes regarding multiple elements :

• Adding a new hashing function hash_password_argon2id and renaming the old one to hash_password_sha512.
• Supporting user authentication regardless of the algorithm hashing their password in the database.
• Using the argon2 hash for new users (via self registering, administrator registering or during the installation process).
• Using the argon2 hash when a users resets it's password or changes it

Password hashes with argon2id are now stored in the database using a prepend "argon2id-" to allow future changes.

[AlexandreDoneux]

Rebase on 2e692aa7.

[AlexandreDoneux]

Rebase on e2de1c37.

[AlexandreDoneux]

I'd recommend moving the latest_method prepending into the hash_password method as suggested

Done