- update to 3.1.5:
  * Update CI workflow matrix for VFX-CY2022
  * Use _WIN32 instead of _MSC_VER to fix mingw build
  * Fix 32-bit x86 build failure with 16c instructions
  * Move numeric_limits specializations into half.h
  * Change references to "master" branch to "main"
  * Remove some simple typos in the code
  * Added missing check _M_IX86 or _M_X64 when using __lzcnt.
  * SolveNormalizedCubic fix to return proper real root
  * Add docs target only if not a subproject
  * Fix docs race condition and make installation optional
  * Remove dead PyImath code and references to ilmbase
  * Use equalWithAbsError instead of equal operator for float
  * Fix sphinx warnings and man page filenames
  * Adding missing stdexcept header
  * for better SIMD auto-vectorization
  * Remove extra project layer for the pyimath code
  * Successor/predecessor functions use isnan() and isinf()
  * Fix python imath export
  * Cuda safety fixes
  * Sort Imath source files
  * Fix formatting in release notes (forwarded request 984250 from dirkmueller)

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