Auto Butcher

Fixed
- Culling didn't actually kill anything on dedicated servers. The damage
  it applied was rejected by the server, so creatures were targeted over
  and over and survived. They now die on the first attempt and leave a
  corpse the Auto Butcher harvests seconds later.
- The Auto Butcher did nothing while the server was empty. After a
  restart with no players online, the creatures around it stayed
  suspended and it had nothing to work with. While a harvesting tool is
  loaded, it now keeps its own area active and wakes creatures within
  range, so it keeps working with nobody logged in.

Changed
- Culling now covers 1% to 50% matured, instead of starting at 5%.
  Newborns are dealt with sooner, and anything you want to keep can
  still be claimed.

Notes
- Keeping the area active only happens while a tool is loaded. An empty
  Auto Butcher costs the server nothing.