Add ht support #145

Job	Run time
Linux.2: Debug / steps	24m 15s
Linux.1: Release / steps	13m 46s
Linux.3: static / steps	14m 3s
Linux.4: threads=OFF / steps	13m 14s
Linux.5: pkgconfig=OFF, examples=OFF, tools=OFF, docs=OFF, internal deflate / steps	4m 19s
Linux.6: custom namespace / steps	13m 49s
Linux.7: clang / steps	14m 7s
Linux.8: vfx2023 / steps	13m 48s
macOS.1: Release / steps	7m 47s
macOS.2: Debug / steps	18m 41s
macOS.3: static / steps	8m 28s
macOS.4: threads=OFF / steps	7m 35s
macOS.5: pkgconfig=OFF, examples=OFF, tools=OFF, docs=OFF, internal imath+deflate / steps	1m 16s
macOS.6: macos-13 / steps	21m 1s
Windows.1: Release / steps	13m 58s
Windows.2: Debug / steps	36m 35s
Windows.3: static / steps	14m 8s
Windows.4: threads=OFF / steps	14m 27s
Windows.5: pkgconfig=OFF, examples=OFF, tools=OFF, docs=OFF, internal imath+deflate / steps	2m 10s
Windows.6: vfx2022 / steps	13m 50s
	4h 31m 17s

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