Generate local IDs from map.json files

data/maps/BirthIsland_Exterior/map.json

@@ -15,6 +15,7 @@
   "connections": null,
   "object_events": [
     {
+      "local_id": "LOCALID_BIRTH_ISLAND_EXTERIOR_ROCK",
       "graphics_id": "OBJ_EVENT_GFX_DEOXYS_TRIANGLE",
       "x": 15,
       "y": 12,
@@ -28,6 +29,7 @@
       "flag": "FLAG_HIDE_BIRTH_ISLAND_DEOXYS_TRIANGLE"
     },
     {
+      "local_id": "LOCALID_BIRTH_ISLAND_DEOXYS",
       "graphics_id": "OBJ_EVENT_GFX_DEOXYS",
       "x": 15,
       "y": 3,

data/maps/BirthIsland_Exterior/scripts.inc

@@ -1,7 +1,3 @@
-.set LOCALID_DEOXYS, 2
-
-@ Note: LOCALID_BIRTH_ISLAND_EXTERIOR_ROCK is a local id for this map used elsewhere. It's defined in event_objects.h
-
 BirthIsland_Exterior_MapScripts::
 	map_script MAP_SCRIPT_ON_TRANSITION, BirthIsland_Exterior_OnTransition
 	map_script MAP_SCRIPT_ON_RESUME, BirthIsland_Exterior_OnResume
@@ -39,7 +35,7 @@ BirthIsland_Exterior_OnResume:
 BirthIsland_Exterior_EventScript_TryRemoveDeoxys::
 	specialvar VAR_RESULT, GetBattleOutcome
 	goto_if_ne VAR_RESULT, B_OUTCOME_CAUGHT, Common_EventScript_NopReturn
-	removeobject LOCALID_DEOXYS
+	removeobject LOCALID_BIRTH_ISLAND_DEOXYS
 	return
 
 BirthIsland_Exterior_EventScript_Triangle::
@@ -77,14 +73,14 @@ BirthIsland_Exterior_EventScript_Deoxys::
 	dofieldeffect FLDEFF_DESTROY_DEOXYS_ROCK
 	playbgm MUS_RG_ENCOUNTER_DEOXYS, FALSE
 	waitfieldeffect FLDEFF_DESTROY_DEOXYS_ROCK
-	addobject LOCALID_DEOXYS
-	applymovement LOCALID_DEOXYS, BirthIsland_Exterior_Movement_DeoxysApproach
+	addobject LOCALID_BIRTH_ISLAND_DEOXYS
+	applymovement LOCALID_BIRTH_ISLAND_DEOXYS, BirthIsland_Exterior_Movement_DeoxysApproach
 	waitmovement 0
 	waitse
 	playmoncry SPECIES_DEOXYS, CRY_MODE_ENCOUNTER
 	delay 40
 	waitmoncry
-	setvar VAR_LAST_TALKED, LOCALID_DEOXYS
+	setvar VAR_LAST_TALKED, LOCALID_BIRTH_ISLAND_DEOXYS
 	seteventmon SPECIES_DEOXYS, 30
 	setflag FLAG_SYS_CTRL_OBJ_DELETE
 	special BattleSetup_StartLegendaryBattle