Change endianness of location_ values.
have_required_item -> join_item_to_escapeitem.
item_to_bitmask -> item_to_escapeitem.
Add a note to remark on action_posion not using pseudocode style.

(It was one of the first functions reversed.)
$81A3 initially hold static tiles in addition to being game state variables.
Change endianness of location_ values (part 2).