Add Initial Qt6 Build Support #241

Job	Run time
build (master, windows-2022)	39m 30s
build (master, windows-2019)	38m 13s
build (master, ubuntu-22.04)	2m 32s
build (master, ubuntu-20.04)	2m 43s
build (master, macos-14)	2m 19s
build (master, macos-13)	4m 3s
build (latest-release, windows-2022)	41m 23s
build (latest-release, windows-2019)	39m 49s
build (latest-release, ubuntu-22.04)	2m 42s
build (latest-release, ubuntu-20.04)	3m 7s
build (latest-release, macos-14)	2m 14s
build (latest-release, macos-13)	3m 54s
	3h 2m 29s

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