Killing off inconsistencies with impact wrenches / combi-tools (#7269)

Part 1 in the "why my impact wrench no wrench bolt" saga

tl;dr for end users: combitools / impact wrenches now work on everything their non-powered versions do (except mechs and RIGs, tune in next time on dragon ball Z for that)

essentially all this PR does is murder every istype() check possible that could use a helper function instead, most notably many pen checks with ispen(). it also repaths combitools and powerdrills to /obj/item/weapon so they aren't instantly taken out of contention by half of the known attackby() prompts

I already squashed a couple runtimes here and there from the pen changes and it's possible I missed another because pencode is another scourge upon our lives

code/_helpers/unsorted.dm

@@ -876,7 +876,7 @@ proc/is_hot(obj/item/W as obj)
 	return ( \
 		W.sharp													  || \
 		W.isscrewdriver()                   || \
-		istype(W, /obj/item/weapon/pen)                           || \
+		W.ispen()                           || \
 		W.iswelder()					  || \
 		istype(W, /obj/item/weapon/flame/lighter/zippo)			  || \
 		istype(W, /obj/item/weapon/flame/match)            		  || \