Some settings cannot be set via environment

[Shahar "Dawn" Or]

It seems that some settings cannot be set via environment. Because:

They have underscores in their names.
And the separator (as in config::Environment::separator) is an underscore.

For example, one might try to set database.database_type via MCAPTCHA_DATABASE_DATABASE_TYPE.
But that doesn't work. Because it will be resolved to database.database.type 😟 😢 .

Some users of the config crate are confused about this, but here's the gist of it, as far as I understand: you can't use the separator in a name.

[Shahar "Dawn" Or]

Thank you!