Finish removing Imath include #3

Job	Run time
windows-2019 VS2019	24m 35s
VFX2019 gcc6/C++14 py2.7 boost1.66 exr2.4 ocio1.1	1m 20s
macos-12 appleclang13/C++17 py3.10 MacOS-12	18m 19s
Ubuntu latest releases gcc12 C++17 avx2 exr3.2 ocio2.3	20m 17s
VFX2020 gcc6/C++14 py3.7 boost1.70 exr2.4 ocio1.1	1m 20s
macos-13 appleclang14/C++17 py3.11 MacOS-13	21m 7s
Ubuntu bleeding edge gcc14 C++20 py3.12 OCIO/libtiff/exr-master boost1.74 avx2	22m 13s
VFX2021 gcc9/C++17 py3.7 boost1.73 exr2.5 ocio2.0	1m 41s
macos-14 appleclang15/C++20 py3.11 MacOS-14-ARM	10m 2s
Ubuntu clang14 C++20 avx2 exr3.1 ocio2.1	17m 31s
VFX2021 clang10/C++14 avx2 exr2.5 ocio2.0	1m 41s
windows-2022 VS2022	9m 44s
Ubuntu debug gcc7/C++14, sse4.2, exr2.4	15m 10s
VFX2022 gcc9/C++17 py39 boost1.76 exr3.1 ocio2.1	1m 44s
VFX2022 clang13/C++17 py39 avx2 exr3.1 ocio2.1	1m 44s
Ubuntu gcc8 C++17 avx exr2.5	13m 7s
VFX2022 icc/C++17 py3.9 boost1.76 exr3.1 ocio2.1 qt5.15	1m 42s
Ubuntu static libs gcc7 C++14 exr2.4	13m 24s
VFX2022 icx/C++17 py3.9 boost1.76 exr3.1 ocio2.1 qt5.15	1m 45s
Ubuntu clang-format	4m 38s
VFX2022 sanitizers	1m 46s
VFX2023 gcc11/C++17 py3.10 boost1.80 exr3.1 ocio2.2	13m 47s
VFX2024 gcc11/C++17 py3.11 boost1.82 exr3.2 ocio2.3	9m 22s
VFX2019 oldest/hobbled gcc6.3/C++14 py2.7 boost-1.66 exr-2.4 no-sse no-ocio	1m 17s
VFX2023 abi check	5m 41s
	3h 54m 57s

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