This change also starts migrating the internals of the DatItem formats to the new internal models. Right now, it's basically just acting like a wrapper around those models.
This was the last of the major bits of code that was technically distinct from Cleaning. This means that each of the bits of functionality that used to all be in Cleaner are split out into their approrpriate classes.
This had the potential to cause a lot of issues the way it was. Moving the actual functionality for cleaning, filtering, and applying extras to their appropriate classes allows for less redirection when calling into the code. Modification as a class was essentially a shell around things that should have just been a single call.
