MainWindowController needs refactoring

[SamCarlberg]

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• Code generation should get moved out to its own class
• Ditto for deploy (until it gets removed entirely)

There might be more stuff that ends up needing to get moved around as well.

[JLLeitschuh]

Single responsibility principle. Good call.

If you could try to write tests for the individual components as you split it apart that would be awesome.