Argon2

Support password derivation using argon2id. Requires that the `rounds` parameter of the output string support being encoded as a string to include argon config.

Libraries:
 * Browser: [argon2-browser](https://github.com/antelle/argon2-browser)
   * [Webpack](https://github.com/antelle/argon2-browser/tree/master/examples/webpack)
 * Node: [argon2](https://github.com/ranisalt/node-argon2)