Zombie Invasion mode

[Enakai]

I like this, but I think that's probably pretty obvious. I've been playing around with the necrovirus disease reagent and have had a lot of fun with it. I think the game mode could be relatively interesting as a "disaster" like round. In my mind, it'd start off slow - A zombie or two gradually picking off crew and growing their horde. Later down the track the survivors would have to defend against an onslaught of the undead. Having them able to transmit the disease via a "bite" would be awesome.