With the recent update to NUT-08, we can ensure that the amount of blank
outputs is always enough to cover any overpaid lightning fees. This
change implements this functionality for both the wallet and the mint.
The mint updateis backwards-compatible with respect to old wallets.
* relative import all the things
* make format
* add __init__.py to cli/
* fix mypy errors
* get rid of more mypy
* mypy fix crud.py
* fix another mypy error