Code Refactor

Code refactoring in this game is going to be hell:

- Save loading isn't compatible with new versions, needs to be fixed
- Levels are just full of if statements and objects
- Bad code, bad code anywhere

If you have the sanity to fix most of the issues here, I'll give you 1000000$ (actually I am broke)

Start by locating the save-loading code and the level logic described in the issue. Review how saves are versioned and how levels currently use if statements and objects. Done means making save loading compatible with newer versions and substantially improving the identified level code, but the issue does not define a precise scope or tests.

Written by the indexing model from the issue text.