Add hsDarwin.h with helpers for string conversion #2367

Job	Run time
macos-x64-internal-release	8m 3s
macos-x64-internal-debug	1s
macos-x64-external-release	7m 43s
linux-x64-internal-release	9m 59s
linux-x64-internal-debug	10m 28s
linux-x64-external-release	8m 49s
Check for Max SDK	1s
maxplugin-${{ matrix.cfg.str }}-${{ matrix.cfg.sdk-version }}	0s
windows-x86-internal-release	17m 1s
windows-x86-internal-debug	13m 38s
windows-x86-external-release	16m 20s
windows-x64-internal-release	18m 35s
windows-x64-internal-debug	15m 12s
windows-x64-external-release	16m 31s
	2h 22m 21s

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