Updated drowfort based upon SWP upstreams

In case you'd like it, this pull request merges in all the recent changes that have happened in studded with patches into Drow Fortress.

Rather than simply merging from unified (which I've rebased in the past), it contains merges of the new nerfed diseases code, master patches, and updates to dfhack_r4 (stonesense, etc).

Enjoy! :)

~ pjf