Refactor hit weight data initialization to be fully contained inside creature implementation. Incidentally make it work.
Change creature::effects into an unordered_map and clean up the implementation.
Add value map to creature to store misc key/value pairs.
Overhaul RC car driving system.

Replace game member with entry in player's creature::value map so car driving is persisted across save/load.
Move methods for finding RC items to map and player classes.
Fix bug where RC car keeps spamming its menu when it runs out of batteries.
Merge branch 'rc-car-overhaul' of https://github.com/kevingranade/Cataclysm-DDA into kevingranade-rc-car-overhaul
tweaks

Had to adjust a few things.