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/SaffronCity_Dojo/map.json

@@ -17,7 +17,7 @@
   "object_events": [
     {
       "type": "object",
-      "graphics_id": "OBJ_EVENT_GFX_BLACKBELT",
+      "graphics_id": "OBJ_EVENT_GFX_BLACK_BELT",
       "x": 11,
       "y": 10,
       "elevation": 3,
@@ -31,7 +31,7 @@
     },
     {
       "type": "object",
-      "graphics_id": "OBJ_EVENT_GFX_BLACKBELT",
+      "graphics_id": "OBJ_EVENT_GFX_BLACK_BELT",
       "x": 1,
       "y": 10,
       "elevation": 3,
@@ -45,7 +45,7 @@
     },
     {
       "type": "object",
-      "graphics_id": "OBJ_EVENT_GFX_BLACKBELT",
+      "graphics_id": "OBJ_EVENT_GFX_BLACK_BELT",
       "x": 11,
       "y": 8,
       "elevation": 3,
@@ -59,7 +59,7 @@
     },
     {
       "type": "object",
-      "graphics_id": "OBJ_EVENT_GFX_BLACKBELT",
+      "graphics_id": "OBJ_EVENT_GFX_BLACK_BELT",
       "x": 1,
       "y": 8,
       "elevation": 3,
@@ -74,7 +74,7 @@
     {
       "local_id": "LOCALID_KARATE_MASTER",
       "type": "object",
-      "graphics_id": "OBJ_EVENT_GFX_BLACKBELT",
+      "graphics_id": "OBJ_EVENT_GFX_BLACK_BELT",
       "x": 6,
       "y": 5,
       "elevation": 3,