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

data/maps/FiveIsland/map.json

@@ -103,14 +103,5 @@
       "player_facing_dir": "BG_EVENT_PLAYER_FACING_ANY",
       "script": "FiveIsland_EventScript_IslandSign"
     }
-  ],
-  "heal_locations": [
-    {
-      "id": "HEAL_LOCATION_FIVE_ISLAND",
-      "x": 18,
-      "y": 7,
-      "respawn_map": "MAP_FIVE_ISLAND_POKEMON_CENTER_1F",
-      "respawn_npc": "LOCALID_FIVE_ISLAND_NURSE"
-    }
   ]
 }