Rename `usd.h` to `usd.hh`, and put its declarations in the `blender::io::usd` namespace. Pull Request: https://projects.blender.org/blender/blender/pulls/117897
Rename `usd.h` to `usd.hh`, and put its declarations in the `blender::io::usd` namespace. Pull Request: https://projects.blender.org/blender/blender/pulls/117897