Add audio support
Needed for bone drilling simulation
Some options:
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http://www.openal-soft.org/ (LGPL)
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https://www.sfml-dev.org/index.php (zlib license)
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https://github.com/google/pindrop (Apache License v2.0)
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https://www.libsdl.org/ (zlib license) [Nick: we can possibly separate out the audio from SDL. I think VTK uses SDL for VR, but AFAIK it uses GLUT for non-VR]