Remove the ability for blobs to spawn offstation

[ferriswheel1]

There was a suggestion a while back to let blobs communicate using the voices of people it had absorbed. Sounded pretty neat, and being able to communicate with the crew would be a nice way to spice up blob rounds.

Maybe blobs could generate some sorta independent NPC slime minions or slime zombies created from absorbed people too, would certainly make multitasking easier when you've got the entire crew bearing down on you with flamethrowers.