Made human products get human 'vitamin' and vitamin inheritance

[PatrikLundell]

Summary

None

Purpose of change

Fix #75540.

Describe the solution

• Give human_flesh_vitamin to all edible human butchery products.
• Ditto to mutant humans.
• Copied "real" vitamins from the base items unless other values were specified.
• Changed the human_flesh_vitamin usage to mirror the meat_allergen one, i.e. 1 unit assigned. As far as I could see all usages in the code uses binary matches, so it won't change anything in practice.

Describe alternatives you've considered

Try to deal with zombies. Zombie arms and legs really should be tagged as "human". Considered scope creep.
Try to deal with all mutants. It's weird there are no vitamins for poisonous and mutagenic stuff, for instance. Scope creep and requires judgement.

Testing

Debug spawned a human corpse, butchered it fully, and examined the products.

Additional context

I made a quick attempt to use the extend syntax instead of copying vitamins, but it didn't seem to work for vitamins. Didn't bother to pursue this avenue further.
Neither scrap meat or human scrap meat show any real vitamins, presumably because the level is too low, but it's still odd, when the definition is 1 iron.

[RedMisao]

Thank you for fixing this