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/ATMOSPHERICS/components/unary/cold_sink.dm

@@ -87,7 +87,7 @@
 /obj/machinery/atmospherics/unary/freezer/tgui_act(action, params)
 	if(..())
 		return TRUE
-	
+
 	. = TRUE
 	switch(action)
 		if("toggleStatus")
@@ -169,7 +169,7 @@
 
 	..()
 
-/obj/machinery/atmospherics/unary/freezer/examine(mob/user)
+/obj/machinery/atmospherics/unary/freezer/examine(mob/user, distance, infix, suffix)
 	. = ..()
 	if(panel_open)
 		. += "The maintenance hatch is open."

code/ATMOSPHERICS/components/unary/heat_source.dm

@@ -156,7 +156,7 @@
 
 	..()
 
-/obj/machinery/atmospherics/unary/heater/examine(mob/user)
+/obj/machinery/atmospherics/unary/heater/examine(mob/user, distance, infix, suffix)
 	. = ..()
 	if(panel_open)
 		. += "The maintenance hatch is open."

code/ATMOSPHERICS/components/unary/vent_pump.dm

@@ -165,7 +165,7 @@
 		soundloop.stop()
 		return 0
 	if(!use_power)
-		soundloop.stop() 
+		soundloop.stop()
 		return 0
 	if(welded)
 		soundloop.stop()
@@ -400,9 +400,9 @@
 	else
 		..()
 
-/obj/machinery/atmospherics/unary/vent_pump/examine(mob/user)
+/obj/machinery/atmospherics/unary/vent_pump/examine(mob/user, distance, infix, suffix)
 	. = ..()
-	if(Adjacent(user))
+	if(distance < 2)
 		. += "A small gauge in the corner reads [round(last_flow_rate, 0.1)] L/s; [round(last_power_draw)] W"
 	else
 		. += "You are too far away to read the gauge."

code/ATMOSPHERICS/components/unary/vent_scrubber.dm

@@ -286,9 +286,9 @@
 			"You hear a ratchet.")
 		deconstruct()
 
-/obj/machinery/atmospherics/unary/vent_scrubber/examine(mob/user)
+/obj/machinery/atmospherics/unary/vent_scrubber/examine(mob/user, distance, infix, suffix)
 	. = ..()
-	if(Adjacent(user))
+	if(distance < 2)
 		. += "A small gauge in the corner reads [round(last_flow_rate, 0.1)] L/s; [round(last_power_draw)] W"
 	else
 		. += "You are too far away to read the gauge."