Add Initial Qt6 Build Support #238

Job	Run time
build (master, windows-2022)	31m 16s
build (master, windows-2019)	31m 16s
build (master, ubuntu-22.04)	2m 32s
build (master, ubuntu-20.04)	3m 4s
build (master, macos-14)	13m 4s
build (master, macos-13)	4m 24s
build (latest-release, windows-2022)	31m 18s
build (latest-release, windows-2019)	31m 18s
build (latest-release, ubuntu-22.04)	2m 27s
build (latest-release, ubuntu-20.04)	2m 49s
build (latest-release, macos-14)	11m 55s
build (latest-release, macos-13)	3m 58s
	2h 49m 21s

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