CMake support for Qt5 and Qt6 #1031

Job	Run time
build (ubuntu-20.04, 5.15)	3m 53s
cmake-build (6.6, qt5compat, ubuntu-20.04)	4m 46s
build (ubuntu-20.04, 6.5)	4m 40s
cmake-build (6.6, qt5compat, windows-latest)	5m 9s
build (ubuntu-20.04, 6.6)	4m 42s
cmake-build (6.6, qt5compat, macos-latest)	3m 22s
build (windows-latest, 5.15)	4m 29s
build (windows-latest, 6.5)	6m 18s
build (windows-latest, 6.6)	6m 17s
build (macos-latest, 5.15)	3m 52s
build (macos-latest, 6.5)	3m 31s
build (macos-latest, 6.6)	4m 36s
build (osx-latest, 6.5)	1s
build (osx-latest, 6.6)	1s
Draft GitHub Release	0s
	55m 37s

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