- use portable separators
- paths should be prepended with r' (so backwards slash isn't treated as escaping)
- sqlite connections should be closed (otherwise windows fails to remove the underlying db file)
- workaround for emojis via PYTHONUTF8=1 test for now
- make ZipPath portable
- properly use tox python environment everywhere
this was causing issues on Windows
e.g.
WARNING: test command found but not installed in testenv
cmd: C:\hostedtoolcache\windows\Python\3.9.12\x64\python3.EXE
