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

data/maps/BattleFrontier_OutsideEast/map.json

@@ -526,12 +526,5 @@
       "player_facing_dir": "BG_EVENT_PLAYER_FACING_ANY",
       "script": "Common_EventScript_ShowPokemonCenterSign"
     }
-  ],
-  "heal_locations": [
-    {
-      "id": "HEAL_LOCATION_BATTLE_FRONTIER_OUTSIDE_EAST",
-      "x": 3,
-      "y": 52
-    }
   ]
 }