Split files from event_scripts.s

Also move maps/scripts to scripts/maps

data/scripts/maps/SouthernIsland_Exterior.inc

@@ -0,0 +1,55 @@
+SouthernIsland_Exterior_MapScripts:: @ 82429C8
+	map_script 3, SouthernIsland_Exterior_MapScript1_2429CE
+	.byte 0
+
+SouthernIsland_Exterior_MapScript1_2429CE: @ 82429CE
+	setflag FLAG_UNLOCK_SOUTHERN_ISLAND
+	end
+
+SouthernIsland_Exterior_EventScript_2429D2:: @ 82429D2
+	lock
+	faceplayer
+	msgbox SouthernIsland_Exterior_Text_2A69F1, 5
+	compare_var_to_value VAR_RESULT, 0
+	goto_eq SouthernIsland_Exterior_EventScript_242A17
+	msgbox SouthernIsland_Exterior_Text_2A6A5D, 4
+	closemessage
+	applymovement VAR_LAST_TALKED, SouthernIsland_Exterior_Movement_2725AA
+	waitmovement 0
+	delay 30
+	hideobjectat 1, SOUTHERN_ISLAND_EXTERIOR
+	setvar VAR_0x8004, 2
+	call SouthernIsland_Exterior_EventScript_272250
+	warp LILYCOVE_CITY_HARBOR, 255, 8, 11
+	waitstate
+	release
+	end
+
+SouthernIsland_Exterior_EventScript_242A17:: @ 8242A17
+	msgbox SouthernIsland_Exterior_Text_2A6A82, 4
+	release
+	end
+
+BattleFrontier_OutsideWest_EventScript_242A21:: @ 8242A21
+	applymovement 255, BattleFrontier_OutsideWest_Movement_242A37
+	waitmovement 0
+	return
+
+BattleFrontier_OutsideWest_EventScript_242A2C:: @ 8242A2C
+	applymovement 255, BattleFrontier_OutsideWest_Movement_242A39
+	waitmovement 0
+	return
+
+BattleFrontier_OutsideWest_Movement_242A37: @ 8242A37
+	step_down
+	step_end
+
+BattleFrontier_OutsideWest_Movement_242A39: @ 8242A39
+	step_left
+	step_25
+	step_end
+
+SouthernIsland_Exterior_EventScript_242A3C:: @ 8242A3C
+	msgbox SouthernIsland_Exterior_Text_2A6AD5, 3
+	end
+