Secure Random & Better Hashing Algorithm Support

[TheDGOfficial]

Is your feature request related to a problem? Please describe.
Generating randomness with the random source of new java.util.Random() is not secure. MD5 or SHA-256 as a hashing algorithm is also not secure.

Describe the solution you'd like
It should be kept like that for compatibility reasons and the performance penalty of new java.security.SecureRandom(), but there should be a config option to switch over to new java.security.SecureRandom().

For the hashing; the default hashing algorithm should also be kept like that, but there should be warnings and a config option to switch over to a new algorithm, like Argon2 (for auth scripts, resource intensive and may be hard to implement but it will be secure)

Describe alternatives you've considered
N/A

Additional information
N/A