All dependencies relative to hash function implementation are now optional, dynamically imported only when the hash functions using them are used for the first time. Running pip install --upgrade multiformats will not install any of them, but they can be all installed by running pip install --upgrade multiformats[full]. In particular, this closes https://github.com/hashberg-io/multiformats/issues/4.
Hash function implementations are loaded and registered transparently on first use, to reduce memory footprint and module loading times. Analogously, a number of multibases are created and registered transparently on first use.
All hash functions with a readily available, well-supported existing Python implementation are now supported.
Finally, closes https://github.com/hashberg-io/multiformats/issues/3.