Refactors Sign Language code so instead of copy-pasting the same giant wall of checks we can just use a proc.
Also now checks to see if your limb is disabled, which fixes people with disabled robotic limbs being able to sign still.
Finally, the tongue only has ORGAN_UNREMOVABLE if you attained it from the trait. I've been told that the tongue could be attained from meateors and I think that's funny as hell so I swapped that over.
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