Generate heal location constants automatically, move data back to a single file.

data/maps/OneIsland/map.json

@@ -118,14 +118,5 @@
       "player_facing_dir": "BG_EVENT_PLAYER_FACING_ANY",
       "script": "OneIsland_EventScript_PokemonNetCenterSign"
     }
-  ],
-  "heal_locations": [
-    {
-      "id": "HEAL_LOCATION_ONE_ISLAND",
-      "x": 14,
-      "y": 6,
-      "respawn_map": "MAP_ONE_ISLAND_POKEMON_CENTER_1F",
-      "respawn_npc": "LOCALID_ONE_ISLAND_NURSE"
-    }
   ]
 }