IC_zombie damage nerf

nerfing damage of all Bacon Zombies
should make melee viable to use, and make it possible to spawn bigger waves

melee zombies now take 10 ish hits to down a player (depending on where they hit)
bombers don't oneshot anymore
exploder were unchanged cause we like the BOOM

I would've loved to tune it further down and have a chance of bleed/poison effects on some zombie attacks, but this sadly is the extend of my modding knowledge