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/modular_computers/computers/modular_computer/damage.dm

@@ -1,4 +1,4 @@
-/obj/item/modular_computer/examine(var/mob/user)
+/obj/item/modular_computer/examine(mob/user, distance, infix, suffix)
 	. = ..()
 	if(damage > broken_damage)
 		. += "<span class='danger'>It is heavily damaged!</span>"
@@ -52,4 +52,4 @@
 		if(HALLOSS)
 			take_damage(Proj.damage, Proj.damage / 3, 0)
 		if(BURN)
-			take_damage(Proj.damage, Proj.damage / 1.5)
+			take_damage(Proj.damage, Proj.damage / 1.5)