Playtesting Teemu v1.21

New data-driven stairs connection system is mostly working. There is one problem area I need to fix and then it's ready. I was wondering if I could put at least some new content in 1.21. Maybe a low nutrition food item that's easy to find, because I find myself drinking rum to stay alive. Now when there are changing number of cave levels the treasure chest creation must be refactored, but that should be easy. Creating the stairs system was a bit hard, but the great thing is that now I can use it in Kaduria too.