[MERGED PR] Makes security slots scale at lower population

[Megapaco]

Lowering the sec slots feels like a decision that makes it kind of resident evil but in space with funny clowns and crappy staffies. A character who's job it is to save the station from threats should have a difficult story arc. This is a good direction.

The funnest security rounds are the ones where you're outgunned and outnumbered, hanging on by a thread.