clldutils 4.0 compat

[johenglisch]

I made the mistake and updated my venv for numeralbank and now it's broken, so down the rabbit hole I go. Assigning myself to get rid of attrs in cltoolkit. @xrotwang Unless you want to do it yourself?

[xrotwang]

Ah, didn't know cltoolkit was used in numeralbank. That's the one package I didn't want to upgrade. Mostly because its functionality is largely superseeded (by accessing CLDF in SQLite).

[johenglisch]

Hm, maybe I can see if can rid numeralbank of the dependency then

[xrotwang]

Yes, that seems easier then porting cltoolkit. As far as I can see, none of the "computing features" functionality, that cltoolkit added for lexibank, is used here.

[LinguList]

If you work on Numeralbank, @johenglisch, please include me as a reviewer in the PR.