Fix easy difficulty stalling auto-evo

[Accidental-Explorer]

Brief Description of What This PR Does

This PR sets osmoregulation cost modifier to 0.9 in easy difficulty to avoid auto-evo not making any species.

Related Issues

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[hhyyrylainen]

I want to wait at least until after 1.0 before merging this. And even then I don't really want to have the easy difficulty to become significantly harder to survive with (as I think osmoregulation cost is almost the most important factor in what makes the game easier).

[Accidental-Explorer]

I want to wait at least until after 1.0 before merging this. And even then I don't really want to have the easy difficulty to become significantly harder to survive with (as I think osmoregulation cost is almost the most important factor in what makes the game easier).

I agree, and I would actually rather further decrease osmoregulation cost for players in easy mode. So I think the better option is to look at the species splitting algorithm and fix it from that side. But I am not sure if I will be able to manage that myself.