feat(balance): Rebalanced occurrences of some specials

[Vollch]

Summary

SUMMARY: Balance "Rebalanced occurrences of some specials"

Purpose of change

With latest changes some specials went way off balance, that an attempt to improve it.
For reference: context, documentation.
There might be more things which need adjustments, feedback welcome.

Describe the solution

Lakes changes:

• All islands increased from 0-1 to 0-3, and untied from cities. Raw occurrences assumes a full lake overmap, so even with 0-3 lakes are desolated enough. And islands shouldn't care about cities at all.
• Island prison got bigger min distance from city - it won't noticeable restrict uniq thing, and just makes sense. Chances slightly increased to compensate land\water normalization.
• Marina become an uniq instead of 0-1, slightly increasing chances(50% to 75%), and also got more forgiving placement restrictions. We don't really care if it will be placed on bumpy coast, as long as edge is matching - inner terrain will be overridden anyway.
• Lighthouse increased from 0-1 to 0-4. That's the only non-uniq lake special worth a visit, some buff won't hurt it.

Land changes:

• Sugar House reduced from 0-10 to 0-4. That's a very bland special, which even paves a road to itself, just adding a mess for no good reason.
• Airports nerfed from 50% to 35%. There's two of them and total 70% seems good enough. Airports are cool, it makes them a bit more valuable.
• Refuge center nerfed from 75% to 50%. Huge ugly thing. Less is better.
• Isherwood got bigger min distance from city. This abomination often bigger than cities, better put in wilderness.
• Necropolist 33% -> 30%, Hub 01 33% -> 35%. Just rounding.

Describe alternatives you've considered

Leaving balancing to someone else.

Testing

Generated some overmaps.

Additional context

[scarf005]

a hecc, house palette error prevents other tests from running. ran local tests insteaed and they passed.