Removed accidental leftover files

Removed custom medical cabinet model

Custom Vscripts have been edited to ensure the infected settings are correct for the campaign

Chainsaw spawns have been added to maps 3, 4 and 5

Bots will now pick up pills and first-aid kits from all medical cabinets, however with pills, they will leave one bottle behind for the player to pick up

An ammo spawn on the hospital bed next to the elevator has been forced to spawn every time

Spitter and Witch have been added to the random infected spawn in the elevator. (6 out of 12 chance to get an infected to spawn)