leedrake5/CloudCal: Neural Networks

Neural networks are now included as a calibration method alongside forest and rainforest models. In addition to this, users have more control over the type of model used, depending on the model type.

A number of other minor improvements are included. Calibration progress can be tracked. It is also possible to load existing .quant files without having to regenerate them, though this can be overridden by the user. Each model type is now siloed away for quick switching back and forth. And changes to the model design for machine learning models must be committed prior to a run. Finally, plots can be generated with different sizes.