Adds the "Gregarious Impetus" effect

Created by: despotate

Feel free to recommend changes, especially about what stage this effect should be in. Personally I think it should be in stage 4 as it is the longest stage and this effect has serious drawbacks and rewards, and should come at the time when people are in maximum panic mode and beginning to quarantine themselves to try to reverse that trend.

All untested of course Tested in-game as human with spawned humans, just werks

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• rscadd: Adds "Gregarious Impetus", a new stage 4 virus effect. It punishes you for not having enough people near you and rewards you when you do have enough people near you. The amount of people that must be near you increases over time if you are being rewarded and decreases if you are being punished. Alkysine works to counteract some of the punishment if you choose to be a hermit anyway.