adds constants, cleans up callstd and msgbox code

* adds some constants for standard script names and messagebox types
* replaces some callstd calls with msgbox calls where equivalent
* replaces msgbox and callstd calls using raw digits with versions that use the constants

data/maps/SootopolisCity_House5/scripts.inc

@@ -2,11 +2,11 @@ SootopolisCity_House5_MapScripts:: @ 8226E93
 	.byte 0
 
 SootopolisCity_House5_EventScript_226E94:: @ 8226E94
-	msgbox SootopolisCity_House5_Text_226EA6, 2
+	msgbox SootopolisCity_House5_Text_226EA6, MSGBOX_NPC
 	end
 
 SootopolisCity_House5_EventScript_226E9D:: @ 8226E9D
-	msgbox SootopolisCity_House5_Text_226F35, 2
+	msgbox SootopolisCity_House5_Text_226F35, MSGBOX_NPC
 	end
 
 SootopolisCity_House5_Text_226EA6: @ 8226EA6