Generate local IDs from map.json files

data/maps/AquaHideout_B2F/map.json

@@ -15,6 +15,7 @@
   "connections": null,
   "object_events": [
     {
+      "local_id": "LOCALID_AQUA_HIDEOUT_MATT",
       "graphics_id": "OBJ_EVENT_GFX_AQUA_MEMBER_M",
       "x": 23,
       "y": 19,
@@ -54,6 +55,7 @@
       "flag": "FLAG_ITEM_AQUA_HIDEOUT_B2F_NEST_BALL"
     },
     {
+      "local_id": "LOCALID_AQUA_HIDEOUT_SUBMARINE",
       "graphics_id": "OBJ_EVENT_GFX_SUBMARINE_SHADOW",
       "x": 19,
       "y": 20,