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/materials/sheets/organic/tanning/hide.dm

@@ -10,7 +10,7 @@
 	stacktype = "hide"
 	no_variants = TRUE
 // This needs to be very clearly documented for players. Whether it should stay in the main description is up for debate.
-/obj/item/stack/animalhide/examine(var/mob/user)
+/obj/item/stack/animalhide/examine(mob/user, distance, infix, suffix)
 	. = ..()
 	. += description_info
 
@@ -27,7 +27,7 @@
 				if(HS.amount < HS.max_amount)
 					H = HS
 					break
-			
+
 			 // Either we found a valid stack, in which case increment amount,
 			 // Or we need to make a new stack
 			if(istype(H))
@@ -38,7 +38,7 @@
 			// Increment the amount
 			src.use(1)
 			scraped++
-		
+
 		if(scraped)
 			to_chat(user, SPAN_NOTICE("You scrape the hair off [scraped] hide\s."))
 	else
@@ -87,4 +87,4 @@
 	desc = "The skin of a terrible creature."
 	singular_name = "alien hide piece"
 	icon_state = "sheet-xeno"
-	stacktype = "hide-xeno"
+	stacktype = "hide-xeno"

code/modules/materials/sheets/organic/tanning/hide_hairless.dm

@@ -11,7 +11,7 @@
 	max_amount = 20
 	stacktype = "hairlesshide"
 
-/obj/item/stack/hairlesshide/examine(var/mob/user)
+/obj/item/stack/hairlesshide/examine(mob/user, distance, infix, suffix)
 	. = ..()
 	. += description_info
 

code/modules/materials/sheets/organic/tanning/leather_wet.dm

@@ -17,7 +17,7 @@
 /obj/item/stack/wetleather/get_drying_state(var/obj/rack)
 	return (drying_wetness > 0 ? "leather_wet" : "leather_dry")
 
-/obj/item/stack/wetleather/examine(var/mob/user)
+/obj/item/stack/wetleather/examine(mob/user, distance, infix, suffix)
 	. = ..()
 	. += description_info
 	. += "\The [src] is [get_dryness_text()]."

code/modules/materials/sheets/organic/tanning/tanning_rack.dm

@@ -35,7 +35,7 @@
 			drying.forceMove(src)
 		update_icon()
 
-/obj/structure/drying_rack/examine(var/mob/user)
+/obj/structure/drying_rack/examine(mob/user, distance, infix, suffix)
 	. = ..()
 	if(drying)
 		. += "\The [drying] is [drying.get_dryness_text()]."
@@ -82,7 +82,7 @@
 		update_icon()
 	return ..()
 
-/obj/structure/drying_rack/attack_robot(var/mob/user)
+/obj/structure/drying_rack/attack_robot(mob/user)
 	if(Adjacent(user))
 		return attack_hand(user)
 	return ..()