Add size types to wandering zeds

[Bio]

I was thinking it would be nice if there was a grading system to how wandering hordes were labeled on the map based upon their size, since a Z on the map could mean anything from a puny 3-6 to a whole city worth of dead.

I was thinking there would be 5 size ratings from packs, herds, mob, horde, to the biggest rating of a swarm

[souricelle]

Could require optics to get the size descriptor too, which would buff the telescope etc.