Collection of minor improvements

[tonypr]

Implements a collection of minor style improvements:

• Prefer random.choice to select a random element of a list.
• Use @dataclass on LandTile and Port classes.
• Iterate over .values() instead of .items() if only iterating over values.
• Return early if exit conditions are met in maintain_longest_road and maintain_largest_army.

No logic changes in this PR, just code style changes mainly. I think they can help make the code easier to change later.

[netlify]

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