Blaze's new & improved charcoal kiln!

This scraps the "sit there and watch it burn" charcoal recipe, and
replaces it with Blaze's automated load-light-and-leave-it! kiln.  I
altered the burn-time to six hours as requested in the forum thread.

http://smf.cataclysmdda.com/index.php?topic=6938.0

FWIW the lit kiln throws enough light to read by.  I'm content to leave
that in, but if it's a problem, we can dial it down.
Merge pull request #8064 from KA101/Blaze'sKiln

Blaze's new & improved charcoal kiln!