Move configuration to TOML

[CamDavidsonPilon]

Python seems to be adopting TOML more and more in its ecosystem 1 2, and TOML appears to be an improvement on INI, and simpler than YAML. Some considerations:

1. Is there reliable backend/client JS TOML parser?
2. TOML parser is not in the Python std library - but the parser is lightweight.
3. The benefit of moving to TOML is not necessarily using their unique features, but avoiding error / ambiguity in users entering information.
4. OTOH, there is some drama around which TOML library to use, and unmaintained libs.

[CamDavidsonPilon]

In Python 3.11 (unreleased as of today), there is a built in TOML library.

[CamDavidsonPilon]

I don't think we should move to TOML

• A TOML table must be populated in a single step; merging multiple TOML files is problematic
• TOML re-introduces what human-friendly languages normally try to get rid of: a verbose syntax and the necessity of using quotes for strings