Streamline skills API by making player::practice() and player::SkillLevel() accept a string identifying the skill.
Streamline recipe declaration by pushing skill lookup down into recipe constructor.
Push skill lookup down into individual item struct constructors.
Fix some indentation.
Simplify a bunch of skill accesses by retrieving them on the fly instead of grabbing a skill object.
Merge branch 'master' of github.com:TheDarklingWolf/Cataclysm-DDA into for-darklingwolf