Add basic loader for gltf

Added loading of avocado. Something is still wrong though,
becaus I cannot see the seed. But basic functionality is there.

utilities/file_utils.h

@@ -3,6 +3,7 @@
 
 #include <stddef.h>
 #include "commons.h"
+#include "cgltf.h"
 
 #define MAX_PATH_LENGTH (4096U)
 
@@ -22,7 +23,7 @@ rse_err_t file_load_pixels(const char* file_name, unsigned char* buffer, size_t*
 
 rse_err_t file_append_full_path(char* file_path, size_t max_buffer_size);
 
-rse_err_t file_json_parser(const char* file_name);
+rse_err_t file_load_gltf(const char* file_name, cgltf_data** data);
 
 #endif /* FILE_UTILS_H */