raw: improvements to raw plugin #5949

Job	Run time
windows-2019 VS2019	52m 16s
macos-12 appleclang13/C++17 py3.10 MacOS-12	21m 29s
windows-2022 VS2022	1h 4m 20s
macos-13 appleclang14/C++17 py3.11 MacOS-13	23m 9s
VFX2021 gcc9/C++17 py3.7 exr3.1 ocio2.0	13m 41s
macos-14 appleclang15/C++20 py3.11 MacOS-14-ARM	10m 42s
Ubuntu latest releases gcc12 C++17 avx2 exr3.2 ocio2.3	18m 31s
VFX2021 clang10/C++17 avx2 exr3.1 ocio2.0	12m 51s
Ubuntu bleeding edge gcc14 C++20 py3.12 OCIO/libtiff/exr-master avx2	8m 10s
VFX2022 gcc9/C++17 py39 exr3.1 ocio2.1	10m 57s
VFX2022 clang13/C++17 py39 avx2 exr3.1 ocio2.1	10m 43s
VFX2022 icc/C++17 py3.9 exr3.1 ocio2.1 qt5.15	13m 54s
Ubuntu all local builds gcc12 C++17 avx2 exr3.2 ocio2.3	18m 47s
VFX2022 icx/C++17 py3.9 exr3.1 ocio2.1 qt5.15	13m 55s
Ubuntu clang14 C++20 avx2 exr3.1 ocio2.1	14m 45s
Ubuntu debug gcc9/C++17, sse4.2, exr3.1	15m 13s
Ubuntu static libs gcc9 C++17 exr2.4	11m 38s
VFX2022 sanitizers	36m 43s
Ubuntu clang-format	3m 37s
VFX2023 gcc11/C++17 py3.10 exr3.1 ocio2.2	11m 25s
VFX2024 gcc11/C++17 py3.11 exr3.2 ocio2.3	12m 7s
VFX2021 oldest gcc9.3/C++17 py3.7 exr-3.1 no-sse no-ocio	16m 24s
VFX2021 hobbled gcc9.3/C++17 py3.7 exr-3.1 no-sse no-ocio	13m 55s
VFX2023 abi check	11m 24s
	7h 20m 36s

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