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.
Was missing a difficulty line.  Fixed in the merge.  For some reason it's not liking your result here, and the space wasn't it.  I'm looking into it.