Move heal locations data to their associated map.json (#673)

data/maps/TwoIsland/map.json

@@ -204,5 +204,14 @@
       "player_facing_dir": "BG_EVENT_PLAYER_FACING_ANY",
       "script": "TwoIsland_EventScript_FastCurrentSign"
     }
+  ],
+  "heal_locations": [
+    {
+      "id": "HEAL_LOCATION_TWO_ISLAND",
+      "x": 21,
+      "y": 8,
+      "respawn_map": "MAP_TWO_ISLAND_POKEMON_CENTER_1F",
+      "respawn_npc": 1
+    }
   ]
 }