Add support for Python 3.8

[bonjourmauko]

Fixes #1035 Fixes #1153 Fixes #1058 Fixes #1111

Breaking changes

• Drop support for NumPy < 1.20
• Drop support for Python < 3.7

New features

• Add support for Python 3.8
• Add CI for Windows

[benjello]

cc @clallemand @pzuldp @benoit-cty for checking if all will go well on CASD ...

[benoit-cty]

cc @clallemand @pzuldp @benoit-cty for checking if all will go well on CASD ...

No problem, here at LexImpact we use Conda on CASD with Python 3.9.

[MattiSG]

(respecting a 48h delay for @openfisca/international-contrib to voice concerns since this major release will drop support for numpy < 1.20)

[bonjourmauko]

I forgot to restore the release cache…

[benoit-cty]

CI is not running, or am I missing something ?

[bonjourmauko]

CI is not running, or am I missing something ?

Please let me update thisd PR (force push) to see if that fixes things.

[bonjourmauko]

Hi @MattiSG, please let me know if you're OK with these changes. I removed the web triggered part to reduce scope.