Fix object event graphic names (#731)

* Fixed object event graphic names

* Updated files and other variable names

* Fix from finding and replacing without matching case

* spritesheet updates

* Update flag name

---------

Co-authored-by: Marcus Huderle <huderlem@gmail.com>

data/maps/RockTunnel_B1F/map.json

@@ -17,7 +17,7 @@
   "object_events": [
     {
       "type": "object",
-      "graphics_id": "OBJ_EVENT_GFX_SUPER_NERD",
+      "graphics_id": "OBJ_EVENT_GFX_POKE_MANIAC",
       "x": 2,
       "y": 6,
       "elevation": 3,
@@ -87,7 +87,7 @@
     },
     {
       "type": "object",
-      "graphics_id": "OBJ_EVENT_GFX_SUPER_NERD",
+      "graphics_id": "OBJ_EVENT_GFX_POKE_MANIAC",
       "x": 23,
       "y": 23,
       "elevation": 3,
@@ -115,7 +115,7 @@
     },
     {
       "type": "object",
-      "graphics_id": "OBJ_EVENT_GFX_SUPER_NERD",
+      "graphics_id": "OBJ_EVENT_GFX_POKE_MANIAC",
       "x": 29,
       "y": 35,
       "elevation": 3,