Restructure CI to use reusable workflow (#455) #530

Job	Run time
Linux.1: Release / steps	7m 55s
Linux.3: static / steps	7m 54s
Linux.2: Debug / steps	7m 48s
Linux.4: pkgconfig=OFF, testing=OFF, python=OFF / steps	3m 6s
Linux.5: custom namespace / steps	7m 53s
Linux.6: clang / steps	7m 53s
Linux.7: vfx2023 / steps	7m 54s
macOS.1: Release / steps	49s
macOS.2: Debug / steps	1m 16s
macOS.3: static / steps	1m 10s
macOS.4: pkgconfig=OFF, testing=OFF / steps	34s
macOS.5: macos-13 / steps	2m 46s
Windows.1: Release / steps	2m 23s
Windows.2: Debug / steps	2m 55s
Windows.3: static / steps	2m 0s
Windows.5: pkgconfig=OFF, testing=OFF / steps	2m 6s
Windows.6: vfx2022 / steps	2m 53s
	1h 9m 15s

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