Document character_event.
Document sub_69DC.
Fix typo.
Improve check_for_pick_up_keypress.
pick_up_related becomes find_nearby_item. Documented.
Document sub_B29F.
Document use_bribe.
expand_object: Move the 'expand:' label into the body of both nested 'do' loops.
Document select_room_maybe.
room_and_tunnels: Note that the room indices start at one.
room_def: room3_hut2_right: Expand out the definition as an example of those bits currently understood.
Document player bounds checking routines.
sub_B14C becomes bounds_check.
sub_B29F becomes indoors_bounds_check.
sixlong_things becomes walls.
wiresnips_related_table becomes fences.