Add support for python3 and general code improvements

[wasi-master]

You would also seen to merge https://github.com/Xion/taipan/pull/2 for python 3.10+ support

If this PR isn't merged and anyone wants to use this library on python 3 then you can install it via

python -m pip install git+https://github.com/wasi-master/taipan git+https://github.com/wasi-master/coded4