#1639 add Argon 2

[heinz]

Please add Argon 2 for key derivation or password hashing https://en.wikipedia.org/wiki/Argon2
That way we would have a state of the art key derivation algorithm.
Furthermore we should be able to choose the options for it (Memory, Iterations and Parallelism).

[Igor Pavlov]

We will need new encryption, only if old encryption will be consider as unsecure.

[heinz]

The key derivation is already considered unsecure, even for two reasons.
1. It doesn't use a salt (pepper and salt). https://github.com/openwall/john/issues/1679 https://crypto.stackexchange.com/questions/30468/is-it-true-that-7zip-doesnt-use-any-salt-with-its-kdf
2. It uses the outdated PBKDF2 https://en.wikipedia.org/wiki/PBKDF2#Alternatives_to_PBKDF2

Edit: And Argon 2 is the best choice for a new algorithm because it's the winner of the Password Hashing Competition