[celx] Implement object:setatmosphere with a table instead of 22 numbers

[375gnu]

+ small cleanup in object:mark.

I doubt that anybody really used method with 22 arguments, so I hope it's safe to change API.

[sonarqubecloud]

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[375gnu]

I also don't like non-const Body::getAtmosphere(). I'd prefer const version only and instead of direct edit of a body's atmosphere do thee following:

Atmosphere atmosphere;
if (body->getAtmosphere() != nullptr)
    atmosphere = *body->getAtmosphere();
...
body->setAtmosphere(atmosphere);

Any thoughts?

One downside is a little bit decreased performance due to initialization and copying objects. But I doubt it will be noticeable.

[ajtribick]

I did originally have a version that replaced the atmosphere instead of editing it, but I'm not sure if anyone's using this to do animations. It's also not clear to me why this method doesn't allow creating an atmosphere if one doesn't exist.