Add addressPrefix parameter, merging with progressCallback, scryptParams and network into options argument

Thoughts @jprichardson ?

If we lost progressCallback, it would be a breaking change.

encrypt(buffer, compressed, passphrase[, options])
decrypt(encryptedKey, passhprase[, options])

Where options is

{
  progressCallback: () => {},
  addressPrefix: 0x00,
  N: 16384,
  r: 8,
  p: 8
}

[dalitsairio]

@youssefgh yes, this would solve your problem. If this feature were developed, you would just have to pass addressPrefix: 0x6F and you’d be fine for the testnet. I’d appreciate an options parameter a lot 💪

[jprichardson]

These seems solid now that I think about it. What about moving compressed to options as well? This really simplifies things especially if we have sane defaults IMHO.