Adds simplemob zombies (DO NOT MERGE YET)

[faaaay]

About The Pull Request

Disclaimer: It'd be ideal to have feedback from other coders before merging this - this is pretty different from things I've coded before and requires some weird stuff to work. In addition, the exact stat values are up for debate with regards to balance.

This PR adds simple_mob zombies that act on their own. They chase players and attack, like any other hostile mob. Upon being "killed", they revive with their brute damage healed 20 seconds to a few minutes later, unless:

• They have enough burn damage to put them down, even when the brute is healed.
• The body is destroyed, either through gibbing or cremation.

The zombies are intended to be weaker than a human with a knife, but still somewhat threatening.

Why It's Good For The Game

This was made at the request of Desminus, so that their zombie event can go ahead.

Changelog

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add: Added simplemob zombies with the ability to revive after death
/:cl: