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/research/designs.dm

@@ -132,7 +132,7 @@ other types of metals and chemistry for reagents).
 	id = "powerdrill"
 	req_tech = list(TECH_MAGNET = 3, TECH_ENGINEERING = 3)
 	materials = list(DEFAULT_WALL_MATERIAL = 60, "glass" = 50)
-	build_path = /obj/item/powerdrill
+	build_path = /obj/item/weapon/powerdrill
 	sort_string = "GAAAD"
 
 ///////////////////////////////////

code/modules/research/xenoarchaeology/chemistry.dm

@@ -14,7 +14,7 @@
 	flags = OPENCONTAINER
 
 obj/item/weapon/reagent_containers/glass/solution_tray/attackby(obj/item/weapon/W as obj, mob/living/user as mob)
-	if(istype(W, /obj/item/weapon/pen))
+	if(W.ispen())
 		var/new_label = sanitizeSafe(input("What should the new label be?","Label solution tray"), MAX_NAME_LEN)
 		if(new_label)
 			name = "solution tray ([new_label])"