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/living/bot/cleanbot.dm

@@ -387,7 +387,7 @@ var/list/cleanbot_types // Going to use this to generate a list of types once th
 		to_chat(user, "<span class='notice'>You add the robot arm to the bucket and sensor assembly. Beep boop!</span>")
 		qdel(src)
 
-	else if(istype(O, /obj/item/weapon/pen))
+	else if(O.ispen())
 		var/t = sanitizeSafe(input(user, "Enter new robot name", name, created_name), MAX_NAME_LEN)
 		if(!t)
 			return