Fix cyborg latejoining, allow mid-round joining, add robot cryo equivalent

Basically, this is #7002 without the runtimes and being left at the BS12 title screen. (and without round-start borgs being humans)

The problem is that the job controller was `Robotize()`ing the new cyborg, then `AttemptLateSpawn()` tried to a) read from the now-deleted pre-robotization mob, and b) `Robotize()` again.

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Adds cyborg cryo equivalent in the drone fabrication room:
![](http://puu.sh/cQYcY/bc3f213e05.png)
Sprites are the suit storage unit sprites and a slightly-edited guest pass terminal sprite.