*actual* final pass at unifying on object event

data/maps/TwoIsland_JoyfulGameCorner/map.json

@@ -14,7 +14,7 @@
   "connections": null,
   "object_events": [
     {
-      "graphics_id": "MAP_OBJ_GFX_BALDING_MAN",
+      "graphics_id": "OBJECT_EVENT_GFX_BALDING_MAN",
       "x": 5,
       "y": 5,
       "elevation": 1,
@@ -27,7 +27,7 @@
       "flag": "0"
     },
     {
-      "graphics_id": "MAP_OBJ_GFX_BIKER",
+      "graphics_id": "OBJECT_EVENT_GFX_BIKER",
       "x": 5,
       "y": 8,
       "elevation": 3,
@@ -40,7 +40,7 @@
       "flag": "FLAG_HIDE_TWO_ISLAND_GAME_CORNER_BIKER"
     },
     {
-      "graphics_id": "MAP_OBJ_GFX_LITTLE_GIRL",
+      "graphics_id": "OBJECT_EVENT_GFX_LITTLE_GIRL",
       "x": 6,
       "y": 5,
       "elevation": 1,
@@ -53,7 +53,7 @@
       "flag": "FLAG_HIDE_TWO_ISLAND_GAME_CORNER_LOSTELLE"
     },
     {
-      "graphics_id": "MAP_OBJ_GFX_MAN",
+      "graphics_id": "OBJECT_EVENT_GFX_MAN",
       "x": 4,
       "y": 2,
       "elevation": 3,