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

data/maps/OldaleTown/map.json

@@ -195,12 +195,5 @@
       "player_facing_dir": "BG_EVENT_PLAYER_FACING_NORTH",
       "script": "Common_EventScript_ShowPokemartSign"
     }
-  ],
-  "heal_locations": [
-    {
-      "id": "HEAL_LOCATION_OLDALE_TOWN",
-      "x": 6,
-      "y": 17
-    }
   ]
 }