Add some comments to game::list_items, to make it less incomprehensible
Make data structure sane, speed up loop in game::list_items

Replaced a scary triple-nested std::map with a vector. Moved filter-applying code to only happen when the filter is changed (rather than after every draw). General cleanup.
Update indentation/brace style of game::list_items()

Did the style update as a separate commit so that diffs are meaningful.
Split off filter-asking code into its own function, from game::list_items()
Make item filters persistent again
Leave a comment that filter behavior doesn't quite match the text
Move path-to-square drawing code into its own function
Update some comments in game::list_items()
Split off more code into its own function, for readability/modularity
Make reset flag not be the same variable as user input
Add examine capability to nearby item list
Tell the player when their gear is damaged in combat
Make item examination window better, when looking at nearby items
Merge pull request #434 from ethankaminski/interface

Item interface improvements, rewrite of hairy game::list_items() function