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/MossdeepCity_House2/scripts.inc

@@ -2,11 +2,11 @@ MossdeepCity_House2_MapScripts:: @ 82220DE
 	.byte 0
 
 MossdeepCity_House2_EventScript_2220DF:: @ 82220DF
-	msgbox MossdeepCity_House2_Text_222146, 2
+	msgbox MossdeepCity_House2_Text_222146, MSGBOX_NPC
 	end
 
 MossdeepCity_House2_EventScript_2220E8:: @ 82220E8
-	msgbox MossdeepCity_House2_Text_2221A6, 2
+	msgbox MossdeepCity_House2_Text_2221A6, MSGBOX_NPC
 	end
 
 MossdeepCity_House2_EventScript_2220F1:: @ 82220F1
@@ -14,7 +14,7 @@ MossdeepCity_House2_EventScript_2220F1:: @ 82220F1
 	faceplayer
 	waitse
 	playmoncry SPECIES_WINGULL, 0
-	msgbox MossdeepCity_House2_Text_22222E, 4
+	msgbox MossdeepCity_House2_Text_22222E, MSGBOX_DEFAULT
 	waitmoncry
 	closemessage
 	setflag FLAG_0x0E0