- distance is INFINITE, 0, or a positive integer based on get_dist() between
the examiner and examinee's turfs when they are on the same Z. When the
examiner is dead or a ghost, distance is always 0.
- also updates /examine( implementations to use it!
- adds w_class_to_name proc for reusing "It is a X item." examine behavior.
mining satchels automatically collect ore if held in the hands, belt, or suit slot.
pulling an ore box with a satchel collects ore into the ore box instead of the satchel, and empties the satchel if appropriate.
hostile mining drones collect into ore boxes just like people would. Their collection checking view size is smaller.
mining satchels and ore boxes only update their contents hints if examined after it changes, rather than up to once a second regardless of changes.
various doubled messages removed.
removed various dm-land loops in favor of contents addition where it makes sense.