Big one: Nutshell 0.16.0 released with a ton of new features!

Feature overview:

- New binary token format starting with cashuB, saves ~40% space

- Improved offline capabilities and coin selection for wallet

- Ecash fees for mints to protect against abuse and cover operational costs (NUT-02)

- Wallets can stream live updates with websocket subscriptions (NUT-17)

- Multinut payments: pay Lightning invoices from multiple mints (NUT-15)

- Supprt for EUR (currently via Strike only)

- Support for Core Lightning via clnrest.py