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/MagmaHideout_1F/scripts.inc

@@ -8,12 +8,12 @@ MagmaHideout_1F_MapScript1_239886: @ 8239886
 
 MagmaHideout_1F_EventScript_23988C:: @ 823988C
 	trainerbattle 0, TRAINER_GRUNT_38, 0, MagmaHideout_1F_Text_2398BA, MagmaHideout_1F_Text_239964
-	msgbox MagmaHideout_1F_Text_2399B1, 6
+	msgbox MagmaHideout_1F_Text_2399B1, MSGBOX_AUTOCLOSE
 	end
 
 MagmaHideout_1F_EventScript_2398A3:: @ 82398A3
 	trainerbattle 0, TRAINER_GRUNT_39, 0, MagmaHideout_1F_Text_2399F5, MagmaHideout_1F_Text_239ABA
-	msgbox MagmaHideout_1F_Text_239ACD, 6
+	msgbox MagmaHideout_1F_Text_239ACD, MSGBOX_AUTOCLOSE
 	end
 
 MagmaHideout_1F_Text_2398BA: @ 82398BA