Fix more prosthetic-related issues

[MNG-cataclysm]

Summary

Bugfixes "Replace psuedo-feet for prosthetic legs with proper prosthetic versions, and add infrastructure to block some effects prosthetics shouldn't get."

Purpose of change

Fix #69856's remaining issues.

Describe the solution

This PR does two things:

1. Add proper prosthetic feet to go along with the prosthetic legs, getting rid of weird psuedo-limbs involved in that process. This is based off of the infrastructure for prosthetic hands.
2. Using some workaround I found, add and EOC and some effects that prevent certain effects from appearing on prosthetic limbs, like deep bites, infection, poison, frostbite, and more. This keeps artificial limbs from being affected by things they shouldn't and makes them more realistic.

Describe alternatives you've considered

Not doing this, or adding a new field like the one Maleclypse suggested.

Testing

Went into the game and got beat up by a bunch of zombies, didn't get infected on any artificial limbs. Fought some spiders too, didn't get poisoned on any artificial limbs.

Additional context

I've been testing the limb healing effects for prosthetics, and they do indeed heal on their own. I'd need to implement some new C++ changes that gives a flag on artificial limbs that keep from healing, in a later PR probably.