Faster snow removal for bigger xenomorphs

[cuberound]

About the pull request

makes the snow removal dependant of xenomorph size, making it 1,5 ( lesser) to 4 times (big xenos) faster ( still takes a while even for the largest xenos to remove deap snow)

Explain why it's good for the game

removing snow is painful job that makes maps with snow unwanted, huge xenomorphs should not have that hard time showeling some snow out of their way, makes it fair with the flames removing snow PR

Testing Photographs and Procedure

Screenshots & Videos

Put screenshots and videos here with an empty line between the screenshots and the <details> tags.

Changelog

🆑
balance: greatly decreses snow removal time, now it depends on xenomorph size
/:cl:

[github-actions]

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[SabreML]

It looks like /turf/open/snow isn't actually used anywhere other than a nightmare variant of CORSAT. Everything else uses /turf/open/auto_turf/snow, so this needs to be added to that as well.
(I don't know why we have two mostly identical versions of a snow turf)

[SabreML]

LGTM!
I was wondering if the time should be changed from 12 to 18 so that it's unchanged for lesser drones (they now have a time of 8 due to a mob size of MOB_SIZE_XENO_VERY_SMALL), but I don't think it's that much of an issue.
IMO it can just be changed later on if it seems too fast.

[RavinHobo]

crusher snow plough variant when?