Defining Part 1 - Code cleanup toward defines (#19262)

* This is only the beginning

* Update stack.dm

code/game/objects/items/devices/autopsy.dm

@@ -66,7 +66,7 @@
 				chemtraces += V
 
 /obj/item/autopsy_scanner/attackby(obj/item/P, mob/user)
-	if(istype(P, /obj/item/pen))
+	if(is_pen(P))
 		var/dead_name = input("Insert name of deceased individual")
 		var/dead_rank = input("Insert rank of deceased individual")
 		var/dead_tod = input("Insert time of death")

code/game/objects/items/devices/chameleonproj.dm

@@ -148,7 +148,7 @@
 	master.disrupt()
 
 /obj/effect/dummy/chameleon/relaymove(mob/user, direction)
-	if(!isturf(loc) || istype(loc, /turf/space) || !direction)
+	if(!isturf(loc) || isspaceturf(loc) || !direction)
 		return // No magical movement!
 
 	if(can_move)

code/game/objects/items/devices/lightreplacer.dm

@@ -112,7 +112,7 @@
 			qdel(L)
 		return
 
-	if(istype(I, /obj/item/storage))
+	if(isstorage(I))
 		var/obj/item/storage/S = I
 		var/found_lightbulbs = FALSE
 		var/replaced_something = TRUE

code/game/objects/items/devices/paicard.dm

@@ -242,7 +242,7 @@
 		if(pai.master_dna)
 			return
 		var/mob/M = usr
-		if(!istype(M, /mob/living/carbon))
+		if(!iscarbon(M))
 			to_chat(usr, "<font color=blue>You don't have any DNA, or your DNA is incompatible with this device.</font>")
 		else
 			var/datum/dna/dna = usr.dna

code/game/objects/items/devices/taperecorder.dm

@@ -338,7 +338,7 @@
 	update_icon(UPDATE_OVERLAYS)
 
 /obj/item/tape/attackby(obj/item/I, mob/user)
-	if(istype(I, /obj/item/pen))
+	if(is_pen(I))
 		rename_interactive(user, I)
 
 /obj/item/tape/screwdriver_act(mob/living/user, obj/item/I)

code/game/objects/items/devices/traitordevices.dm

@@ -125,7 +125,7 @@
 		to_chat(M, "<span class='danger'>[src] will not work here!</span>")
 
 /obj/item/teleporter/proc/tile_check(turf/T)
-	if(istype(T, /turf/simulated/floor) || istype(T, /turf/space))
+	if(isfloorturf(T) || isspaceturf(T))
 		return TRUE
 
 /obj/item/teleporter/proc/dir_correction(mob/user) //Direction movement, screws with teleport distance and saving throw, and thus must be removed first