Facility items 001 - making cement

Adds all the items necessary for making cement,
Adds recipes for making quicklime and cement,
Makes limestone shards drop in mine storage and sand drop in fields,
Adds recipe for deconstruction of limestone shards to limestone.
Future reference: that space after limestone was a problem, and this was missing a difficulty line.  I've fixed both in the merge, so just keep them in mind in future.