Load texture from glb

Add loading image from glb file.

utilities/file_utils.h

@@ -15,12 +15,10 @@
  * @param bytes_count Returned bytes count
  * @param buffer Returned filled buffer
  */
-rse_err_t file_read_bytes(const char* file_path, size_t* bytes_count, char* buffer);
+rse_err_t file_read_bytes(const char* file_path, size_t* bytes_count, unsigned char* buffer);
 
 rse_err_t file_write(const char* file_name, size_t bytes_count, char* buffer);
 
-rse_err_t file_load_pixels(const char* file_name, unsigned char* buffer, size_t* buffer_size, int* width, int* height);
-
 rse_err_t file_append_full_path(char* file_path, size_t max_buffer_size);
 
 rse_err_t file_load_gltf(const char* file_name, cgltf_data** data);