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/MtPyre_5F/scripts.inc

@@ -3,7 +3,7 @@ MtPyre_5F_MapScripts:: @ 8231C6D
 
 MtPyre_4F_EventScript_231C6E:: @ 8231C6E
 	trainerbattle 0, TRAINER_TASHA, 0, MtPyre_4F_Text_231C85, MtPyre_4F_Text_231CDB
-	msgbox MtPyre_4F_Text_231CEE, 6
+	msgbox MtPyre_4F_Text_231CEE, MSGBOX_AUTOCLOSE
 	end
 
 MtPyre_4F_Text_231C85: @ 8231C85