Fix ferals in hazardous waste sarcophagus

[NetSysFire]

Summary

Bugfixes "No more ferals trapped in chernobyl"

Purpose of change

Fixes #53591. I know that my complaint of lore is the main point there but I am content with just closing it.

Describe the solution

Seperate monster group GROUP_VANILLA_NO_FERAL. Can potentially be used in more than just the hazardous waste sarcophagus. Also normalized GROUP_VANILLA to 1000.

Describe alternatives you've considered

Testing

Teleported into the hazardous waste sarcophagus: No more ferals.

Teleported into the streets of a city: Theres still ferals and zombies.

Additional context

[kevingranade]

I agree special radiation zonbies would be better, but this is definitely an improvement.

[NetSysFire]

I had a brief discussion with kevin on IRC. Hazardous waste sarcophaguses (or sarcophagi?) are actually very rare in the world. Probably a handful, if not less. The one in chernobyl is the most known one, but there is also one in switzerland.
In fact, most of the stuff that came up when searching about that was from our forums, lol.

As you could imagine, I am bringing up the "not realistic" argument. However, this is salvagable. Because of XEDRA.

We officially have nuclear power plants ingame now and there is some nuclear (house hold) stuff anyways. Plus waste sarcophagi are not solely for radioactive things, also for stuff like pcb and dioxine.

I would bet XEDRA will have waste to hide. Heavily contaminated mutant bodies, alien debris from the netherium, byproducts of experiments etc etc. There are two things that could work:

1. Having a normal hazardous waste depot and hiding the stuff in a cavern beneath or something.
2. Having a supposedly normal hazardous waste depot but it is heavily secured with turrets ("so no vandals can leak the radioactive dioxine and pcb!111") and has no hidden area, so if you manage to have the elevator move down you will get a straight to the point alien mess.

This would both work with the lore I introduced in #59618, since they had to hastily depose of stuff once things got hectic. As always, feedback welcome.