Converts some istype's to use helpers (#3224)

Converts various istype's to use helpers. Mainly:
Cable
Wrench
Screwdriver
Multitool
Crowbar
Wirecutter

And makes the helpers defines.

code/modules/mining/abandonedcrates.dm

@@ -199,7 +199,7 @@
 
 /obj/structure/closet/crate/secure/loot/attackby(obj/item/weapon/W as obj, mob/user as mob)
 	if(locked)
-		if (istype(W, /obj/item/device/multitool)) // Greetings Urist McProfessor, how about a nice game of cows and bulls?
+		if (ismultitool(W)) // Greetings Urist McProfessor, how about a nice game of cows and bulls?
 			user << "<span class='notice'>DECA-CODE LOCK ANALYSIS:</span>"
 			if (attempts == 1)
 				user << "<span class='warning'>* Anti-Tamper system will activate on the next failed access attempt.</span>"

code/modules/mining/coins.dm

@@ -45,7 +45,7 @@
 	icon_state = "coin_adamantine"
 
 /obj/item/weapon/coin/attackby(obj/item/weapon/W as obj, mob/user as mob)
-	if(istype(W,/obj/item/stack/cable_coil))
+	if(iscoil(W))
 		var/obj/item/stack/cable_coil/CC = W
 		if(string_attached)
 			user << "<span class='notice'>There already is a string attached to this coin.</span>"
@@ -57,7 +57,7 @@
 		else
 			user << "<span class='notice'>This cable coil appears to be empty.</span>"
 		return
-	else if(istype(W,/obj/item/weapon/wirecutters))
+	else if(iswirecutter(W))
 		if(!string_attached)
 			..()
 			return

code/modules/mining/drilling/drill.dm

@@ -158,7 +158,7 @@
 				return
 	if(active) return ..()
 
-	if(istype(O, /obj/item/weapon/crowbar))
+	if(iscrowbar(O))
 		if (panel_open && cell)
 			user << "You wrench out \the [cell]."
 			cell.forceMove(get_turf(user))
@@ -375,7 +375,7 @@
 	if(default_deconstruction_crowbar(user, W))
 		return
 
-	if(istype(W,/obj/item/weapon/wrench))
+	if(iswrench(W))
 
 		if(istype(get_turf(src), /turf/space))
 			user << "<span class='notice'>You send the [src] careening into space. Idiot.</span>"

code/modules/mining/mine_items.dm

@@ -546,7 +546,7 @@
 		var/turf/T = get_turf(src)
 		T.attackby(C, user)
 		return
-	if (istype(C, /obj/item/weapon/weldingtool))
+	if (iswelder(C))
 		var/obj/item/weapon/weldingtool/WT = C
 		if(WT.remove_fuel(0, user))
 			user << "<span class='notice'>Slicing apart connectors ...</span>"
@@ -1176,7 +1176,7 @@ var/list/total_extraction_beacons = list()
 
 /obj/structure/sculpting_block/attackby(obj/item/C as obj, mob/user as mob)
 
-	if (istype(C, /obj/item/weapon/wrench))
+	if (iswrench(C))
 		playsound(src.loc, 'sound/items/Ratchet.ogg', 100, 1)
 		user << "<span class='notice'>You [anchored ? "un" : ""]anchor the [name].</span>"
 		anchored = !anchored