Create configs to match models and make config parsing for each treatment dynamic

[MikeLippincott]

          just confirming. Whenever you are training a new model, you have to change this model name? And the `config.toml` file name never changes?

I wonder if the file name should also change, in case the parameters change per model. Oh, but maybe these parameters won't change? (It would still likely be good to keep a record of the models that you've tested)

One final point - is the model name arbitrary? In other words, it doesn't specify which treatments to include, it is simply an identifier?

Originally posted by @gwaybio in #36 (comment)