Bugfix update.

Removed pipe bombs and replaced them with bile jars, or nothing at all for headshot only modes. Changes to pistols and pistol ammo, dual pistols should be working correctly again. Zombies received a speed boost to be more realistic (same speed as the witch). Witch recieved a health nerf to 250 health to be crownable again on realism, and to be more realistic.

Slight change to zombie non-headshot damage modifier

Readjusted gun damage to be somewhat less overpowered.

Restored original zombie damage for standard and solo gamemodes.

Lowered pain pill decay factor much further. Med kits and pills should last much longer now.

Various bugfixes and changes.

Fixed Magnum ammo not being replenishable

Slow zombies were a bit too slow.

Added a few cvars to try to ensure no specials or bosses will spawn in the headshot only gamemodes.