[ENHANCEMENT] Use current versions of tiny_object_loader and stb_image_write

**Describe the enhancement**
Use the current version of
* [tiny_object_loader](https://github.com/tinyobjloader/tinyobjloader) and
* [stb_write_image](https://github.com/nothings/stb)

in order to be up-to-date. I was just trying to fix compiler warnings in both files included with blazeRT but first, we should try to use up-to-date versions.