Default to bonus city for refining

[Nfinished]

Adds a couple utils for determining production bonuses, and defaults to production bonus city when refining. I was a little confused by the logic in profit-tree so I didn't give it the same default treatment, I've left a comment on the bit I found confusing.

It looks like the linter also created some whitespace changes so I'd recommend hiding those when reviewing

[ghost]

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[GeekaN2]

Meanwhile, PR looks good, I'll take a better look after the New Year