Re: Advent of Code 2018 megathread

[nickmyers217]

Yeah, day 16 was like a vacation compared to 15. I am back to work debugging 15 
now, and I found an issue with my path finding. I think the best approach to 
debugging it is visualizations, so I am building out a little interactive mode 
that steps through the game step by step visually. Hopefully I can hone in on 
the problem now.