OpenSubdiv v3.5 is released

[David G Yu]

See the release notes for full details:

    https://graphics.pixar.com/opensubdiv/docs/release_35.html

This is a significant release which extends the OpenSubdiv API to support simplified surface evaluation and CPU tessellation along with other improvements and bug fixes.

We presented a high-level introduction to the new API during our SIGGRAPH 2022 BoF (OpenSubdiv content starts at ~2min):

    https://vimeo.com/752352357

The release includes thorough overview documentation and tutorials:

    https://graphics.pixar.com/opensubdiv/docs/bfr_overview.html

    https://graphics.pixar.com/opensubdiv/docs/tutorials.html#bfr-tutorials

Thank you to all of the contributors!

-David