Python 3.10 support

[a-baturin]

Can't install it on Python 3.10
Probably built OCC is not available

[mirmik]

Yep. We use precompiled pythonocc from anaconda. python3.10 was added to anaconda recently and pythonocc for python3.10 missing here. I will gladly add it if the package appears, or we find it in another source.

For now, we can build it by manually.

[a-baturin]

I managed to install OCC and pythonocc-core. Not versions provided with zencad.
Fedora 35
OCCT 7.5.3
pythonocc-core from master branch
Unfortunately I got a error:

test_third_libraries_import finished with exception: /lib64/libTKFeat.so.7: undefined symbol: _ZN18BRepTools_Modifier7PerformERKN11opencascade6handleI22BRepTools_ModificationEERK21Message_ProgressRange

pythonocc founded: /usr/lib/python3.10/site-packages/OCC/__init__.py.
OCCT loading fault.```
Any ideas which could help to run?