added dirtfloor to be excluded from outside
Merge pull request #192 from shmup/master

Dirt floors no longer considered outside.
Optimize caching the per-square is_outside data for the lightmap code, and it works this time.
Inventory: Separated medicine/drugs from food/drinks
Lawnmower blades are now generic blade items, lawnmower stuff has been
renamed to makeshift
Merge branch 'master' of https://github.com/TheDarklingWolf/Cataclysm-DDA