Switch kwargs to function parameters

[jmgate]

INSERT DETAILS HERE.

In extending ShellLogger into the more powerful version of itself, **kwargs were used in a number of places to allow for ease of extensibility. As we get closer to open-sourcing, we should re-evaluate each of these usages to see if there are any keyword arguments that should be spelled out explicitly as function parameters. Past experience indicates spelling out everything explicitly hugely improves maintainability, but we definitely didn't take time initially to think through what exactly we wanted all the interfaces to look like. Yay for agile development 😁

• What needs to be cleaned up?
• How would the refactored implementation differ from what we have now?
• What are the potential downsides to not dealing with the technical debt now and leaving it for later?