Lightspark

- Use a 64-bit nonce for signed requests to avoid conflicts.
- Add `is_internal_payment` fields to payment objects.
- Add `multisig_wallet_address_validation_parameters` to support validating node wallet addresses used for deposits.
- Add `incoming_payments_for_invoice` to get all incoming payments for an invoice.

- Ensure that the README and LICENSE are included in the pypi package.
- Make get_decoded_payment_request return an InvoiceData type.

- Add is_uma flag to payment objects. Note that this is only accurate for payments/invoices created with create_uma_invoice or pay_uma_invoice.
- Tweak the ChannelSnapshot object to make it more expressive.
- Include type info in the package release.

- Update dependencies.

- Update dependencies.

- Add a function for cancelling unpaid invoices.
- Add UMA invites support.