Auto Butcher

Fixed
- Culled babies vanished without leaving a corpse, so nothing was
  harvested from them. They're now killed by damage rather than removed
  outright, which leaves a normal body for the Auto Butcher to process.
- Culling now ignores creatures in their first moments of life and waits
  until they're slightly older, since newborns left nothing behind.
  Anything under 10% matured is still culled well before it grows up.

Changed
- The Auto Butcher now yields more raw meat and hide than harvesting by
  hand: 2x from adult corpses and 6x from babies, which are otherwise
  barely worth processing.
- Raw prime meat and the other baby-specific drops are unchanged.

Logging
- On load, each Auto Butcher records whether it came back in stasis, for
  tracking down a case where a harvester restored from a server restart
  stops working until a player visits it.