* Refactor ventcrawling flag into traits (#56620)
Instead of using var/ventcrawling on `/mob/living`, it is now instead
two traits. It functions in exactly the same way.
This now ensures that manipulation of ventcrawling will not clash with
any other manipulation, such as a proposed genetics ability to give
people ventcrawling, versus abductor organs.
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Intended to be a pure refactor, no functionality should change.
* Refactor ventcrawling flag into traits
* Update true_changeling.dm
* Update true_changeling.dm
Co-authored-by: coiax <yellowbounder@gmail.com>
Co-authored-by: Gandalf2k15 <jzo123@hotmail.com>
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