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/modules/mob/mob_helpers.dm

@@ -1207,8 +1207,8 @@ proc/is_blind(A)
 
 #undef SAFE_PERP
 
-/mob/proc/get_multitool(var/obj/item/device/multitool/P)
-	if(istype(P))
+/mob/proc/get_multitool(var/obj/P)
+	if(P.ismultitool())
 		return P
 
 /mob/abstract/observer/get_multitool()