Refactor overhaul

[nebbles]

A major overhaul is needed. Currently the approach is functional, but already it is getting messy and the need for globals is pressing. Moving to a class based system could be a way out. Or a major revamp of the functional approach is necessary.

Important changes needed as part of this rework:

• Revamp functional or move to class based approach
• Test written for new functions/methods
• New history object for storing history for input fields to files