Refactor file operations out of IO god class

[gopar]

First pass at breaking out the InputOutput god class. For now, separate out file operations and have InputOutput act as a thing wrapper (facade).

I plan on doing more refactors on this class

[dwash96]

Before you get to deep into this, can you start a thread in the discord so we can work out which methods are going to be decomposed into which module files/helper classes? Probably doesn't need to be/shouldn't be figured out for the entirety of it all at once, but io.py is pretty core so I'd prefer to keep eyes on its decomposition