A designator for mining a connected set of mountain tiles that share a roof type (unroofed, constructed, thin rock, overhead mountain, etc).
The primary purpose is to mine tunnels and rooms in mountains that won't trigger infestations.
Thanks to Toasteh & Ogliss & the previous developers of Veinminer which this mod is based on.
http://github.com/sparr/rimworld-mod-Roofminer
