- Move towards std::string over char * and FbxString where convenient,
- Make a clear distinction between textures whose image files have been
located and those who haven't; warn early in the latter case.
- Extend RawTexture so we always know logical name in FBX, original file
name in FBX, and inferred location in local filesystem.
- In non-binary mode, simply output the inferred local file basename as
the URI; this will be the correct relative path as long as the texture
files are located next to the .gltf and .bin files.
Primary remaining urge for a follow-up PR:
- We should be copying texture image files into the .gltf output folder,
but before that we should switch to an off-the-shelf cross-platform
file manipulation library like https://github.com/cginternals/cppfs.
When we make that transition, all this texture resolution code will
undergo another refactoring.
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