examine signature changed to include distance

- 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.

code/modules/hydroponics/beekeeping/beehive.dm

@@ -30,7 +30,7 @@
 			if(81 to 100)
 				add_overlay("bees3")
 
-/obj/machinery/beehive/examine(var/mob/user)
+/obj/machinery/beehive/examine(mob/user, distance, infix, suffix)
 	. = ..()
 	if(!closed)
 		. += "The lid is open."