[Proposal] - Refactor the program into more easily managed files

[simon-wg]

I'm planning to do a major refactor once #73 is merged in order to make the program more easily maintainable.

The current structure of ~1500 lines is a bit rough to navigate when adding features. So dividing up the parts into their own files would provide an easier overview of the program, as well as make it easier to implement new features, and modify existing ones.

Thoughts on this? @AnthonyMichaelTDM