libname: A reimagining of the nanocurrency-web package.

libname: A reimagining of the nanocurrency-web package.

Greater Changes
* Completely replace crypto-js dependency with the browser native Web Crypto API.
* Overhaul wallet system to align more with object-oriented design and to consolidate related but separated functionality.
* Add support for Ledger hardware wallets.
* Encrypt wallet secrets by default on initialization, and add lock/unlock feature to encrypt/decrypt on-demand.
* Add rolodex feature to enable contact management including signature verification using contact name associated with a public key in your rolodex.
* Add online functions to interact with nodes like fetching account info, generating PoW, and sending blocks for processing.
* Add sweep feature similar to the offering from Nault which sends all funds in a specified range of accounts in a wallet to a specific address.
* Refactor key derivation functions to align closer with spec as designed in the relevant BIPs.
* Adopt GPLv3 license and achieve REUSE compliance.

Lesser Changes
* Refactor as ESM instead of CJS and build for ESMNext target to enable more modern browser features.
* Utilize browser native features like bigint instead of bignumber.js dependency.
* Deprecate 'box' feature and with it the dependency on byte-base64.
* Replace chai/mocha test framework with built-in Node.js test runner, and add tons of tests.
* Replace webpack (and dependency ts-loader) with esbuild which offers faster builds and minification.
* Add online function to get the next unopened account of a wallet with the idea that a business could distribute addresses to customers in a custodial manner.
* Add tons of type checking to validate inputs and outputs.
* Deprecate lots of unused code or replace with native features.