OptiX testrender overhaul (take two) #3886

Job	Run time
macos-13 C++17 py3.11 MacOS-13 llvm17	31m 7s
Ubuntu Debug gcc7/C++17 llvm9 py3.7 oiio2.3 exr2.4 sse4 exr2.4	28m 26s
macos-14 C++17 py3.11 MacOS-14-ARM llvm17	12m 2s
VFX2021 gcc9/C++17 llvm11 py3.7 oiio2.4 sse4 batch-b8avx2	17m 46s
Ubuntu gcc10/C++17 llvm10 oiio-release avx2	11m 29s
VFX2022 gcc9/C++17 llvm13 py3.9 exr3.1 oiio-rel avx2	20m 35s
Ubuntu latest releases gcc11/C++17 llvm17 exr3.2 py3.10 avx2 batch-b16avx512	24m 50s
VFX2022 clang12/C++17 llvm12 oiio-main py3.9 avx2 batch-avx512	2m 19s
Ubuntu latest releases +OIIO3 gcc11/C++17 llvm17 exr3.2 py3.10 avx2 batch-b16avx512	24m 57s
VFX2022 gcc9/C++17 llvm11 py3.9 exr3.1 oiio2.3 sse2 batch-b4sse2	20m 46s
Ubuntu bleeding edge gcc12/C++17 llvm17 oiio/ocio/exr/pybind-main py3.10 avx2 batch-b16avx512	24m 56s
VFX2022 icc/C++17 llvm14 py3.9 oiio-main avx2	5m 47s
Ubuntu clang14/C++17 llvm14 py3.8 avx2 batch-b16avx512	7m 16s
VFX2022 icx/C++17 llvm14 py3.9 oiio2.3 avx2	25m 14s
Ubuntu clang-format	4m 30s
VFX2023 gcc11/C++17 llvm15 py3.10 oiio-rel avx2	22m 8s
VFX2023 GPU Cuda11 gcc11/C++17 llvm15 py3.10 OIIO-main avx2	7m 44s
VFX2024 gcc11/C++17 llvm17 py3.11 boost1.82 oiio-rel avx2	25m 38s
VFX2021 oldest everything gcc9/C++17 llvm9 py3.7 oiio2.3 no-simd	10m 6s
VFX2022 sanitizers	32m 1s
VFX2023 abi check	14m 8s
	6h 13m 45s

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