Add support for modular build structure. #559

Job	Run time
windows (msvc-14.2, 14,17, 32,64, windows-2019)	27m 29s
windows (gcc, 14,17, 64, windows-2019)	1m 44s
posix (gcc-6, 14,1z, ubuntu-latest, ubuntu:18.04, g++-6)	11m 36s
posix (gcc-7, 14,17, g++-7, ubuntu-20.04)	10m 17s
windows (msvc-14.3, 14,17, 32,64, windows-2022)	28m 50s
posix (gcc-8, 14, ubuntu-20.04, g++-8)	5m 46s
posix (gcc-9, 14,17, ubuntu-20.04, g++-9)	12m 6s
posix (gcc-10, 14,17, ubuntu-20.04, g++-10)	10m 35s
posix (clang, clang++-3.9, 14, ubuntu-latest, ubuntu:18.04, clang-3.9)	6m 52s
posix (clang, clang++-4.0, 14, ubuntu-latest, ubuntu:18.04, clang-4.0)	6m 27s
posix (clang, clang++-5.0, 14,1z, ubuntu-latest, ubuntu:18.04, clang-5.0)	10m 42s
posix (clang, clang++-6.0, 14,17, ubuntu-20.04, clang-6.0)	11m 0s
posix (clang, clang++-7, 14,17, ubuntu-20.04, clang-7)	10m 57s
posix (clang, clang++-8, 14,17, ubuntu-20.04, clang-8)	11m 4s
posix (clang, clang++-9, 14,17, ubuntu-20.04, clang-9)	11m 9s
posix (clang, clang++-10, 14,17, ubuntu-20.04)	11m 36s
posix (clang, 14,17, macos-12)	9m 43s
	3h 17m 53s

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