Moved code to new graphic_utils.c/.h header and added Rect wrapper struct

source/graphic_utils.c

@@ -0,0 +1,15 @@
+#include <tonc_core.h>
+#include <tonc_tte.h>
+
+#include "graphic_utils.h"
+
+void main_bg_se_clear_rect(Rect rect)
+{
+    for (int y = rect.top; y < rect.bottom; y++)
+    {
+        for (int x = rect.left; x < rect.right; x++)
+        {
+            memset16(&se_mem[MAIN_BG_SBB][x + SCREENBLOCK_ROW_LEN * y], 0x000, 1);
+        }
+    }
+}