Use a passphrase to encrypt user's minting config about loopygen

[Montspy]

Definitely a great idea
I would be reticent to add another passphrase for the user, but you make a good point that the passphrase reset is pretty straightforward.

At a cursory glance there are a few python libraries that implement JWE or JWT. I believe glitchyg is using JWT
JWT looks pretty cool since its JSON in, JSON out - just provide the secret
I'd rather use it vs using bare bcrypt

We can automate the decrypting by passing the passphrase as a command line argument, or a .env variable for advanced users

[Montspy]

Passphrase protected private keys

[sk33z3r]

Tested and working

8f790ed