Zombie Escape Various Changes to Knockback

Hi Folks,

I did a number of changes to the ZE server last night that adjusted the knockback for Zombies. The idea was to make the knockback feel a bit more realistic to what we had with CS:S and I think it's in a much better position. I've replaced the knockback fix with another one that should fix a lot of the issues we had. Since I changed this knockback plugin I had to revert a lot of the adjustments I made to knockback for individual weapons. Those have all been reset and adjusted.

I've also replaced the inferno zombie slowdown plugin so that it's also a little more realistic. Unfortunately it doesn't extinguish in water, I'm looking into that :).

Hope you all enjoy!