Virology shenanigans

*  Now viruses affect only certain species (different for each virus)
*  Spaceacilline is strong now: it prevernts viruses from infecting person, and has a chance to heal virus if it's on stage 1 (no antibodies though, so he can just re-infect)
*  Biosuits and spacesuits now stronger against airborne diseases, and if combined with gloves block contact based ones completely
*  Breathing spreads viurses less often now
*  Sneezing spreads viruses in front of mob now. They get a warning sometimes though, and have whooping 7 ticks to turn away