Refactoring nabu
It would be nice to have a a refactoring of the 'nabu' widget and design.
We could have one dedicated widget to define the nabu settings (close to the 'nabu' slice) that output a nabu settings widget.
Then the nabu settings
from the other widget would be replace by this 'nabu settings' channel and only keep 'dedicated' settings.
This would remove enforcing going through the nabu slice
before processing the nabu volume for example and get closer to the ewoks
design.