Work on line of sight, and a special ability - summon

Tags:dweller screenshots
Behold, the amazing debugging line of sight imagery :P

I've also started working on a special ability - summoning help. I *think* most of the code is done, but it is yet to be tested. On top of that, I think I introduced an infinite loop somewhere in the line of sight code - I started getting annoyed at the mess of X/Y vs tileX/tileY and began some work on it, but I suspect it's missing a conversion somewhere. Well, it *was* very high on the post-MVP priority list, so maybe I'll move it up to happen sooner. Might be easier at this point than reverting tonight's work, hah.