pkg_resources is deprecated

[rolandmas]

Hello, your friendly Debian package maintainier here. It's been brought to my attention that the pkg_resources module is deprecated (see https://setuptools.pypa.io/en/latest/pkg_resources.html); this led to a bug report in the Debian PTS (see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1083524), which I'd like to submit to you. I don't think there's any emergency at this point, but this should be fixed before the module in question is actually removed :-)

[borondics]

@rolandmas, thanks for the note!

@markotoplak, as far as I can see pkg_resources is only used in the PLS widget in orange-spectroscopy? If this is going to move to orange3 maybe we can just remove the widget altogether?

[markotoplak]

@borondics, version checks are easy.

The problem is the namespace package orangecontrib we use. There we need to be a little more careful. Some notes: https://setuptools.pypa.io/en/latest/userguide/package_discovery.html#finding-namespace-packages