Major improvements on Infection System:
- Base Zombies will now spawn where the (S)NPC died on the spot.
- No longer get stuck in each other or that other stuff.
- VJ SNPCs' corpses will now despawn once killed/turned.
- (S)NPCs can now turn anywhere, regardless of distance from zombie.
This is a still WIP, need to figure how to make default NPCs' corpses disappear, same with CPT, Nextbot, etc.

Improved Infection system

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Changed Infection system, Walkers infect NPCs into Walkers while Infected infect NPCs into Infected

Fixed Scientist Infected spawnicon

Added HEV Suit voices for HEV Zombies

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