[feature] replace `toml` with `tomli` or standard Python `tomllib`

[drobnyjt]

Is your feature request related to a problem? Please describe.
toml on PyPi has essentially been deprecated; it does not conform perfectly to the newest toml spec and has not been updated in years.

Proposed solution
As of 2022, the tomli library has, apparently, become the de-factor toml parser for python. It is used as the backend for the standard library implementation.

Related to Issues #287 #279 #277

[drobnyjt]

tomllib is out - it can only parse toml files, not write them.

the standard library documentation recommends tomlkit or tomli. I'll check out the features of both and see which one is a better fit.

[drobnyjt]

tomlkit works great; I'm going to start switching over the dev branch python functions to tomlkit.