Add support for modular build structure. #19

Job	Run time
windows (msvc-14.1, 14,17,latest, 32,64, windows-2016)	1s
posix (gcc-4.8, 03,11, ubuntu-18.04, g++-4.8)	1s
windows (msvc-14.2, 14,17,latest, 32,64, windows-2019)	2m 16s
posix (gcc-5, 03,11,14,1z, ubuntu-18.04, g++-5)	1s
windows (msvc-14.3, 14,17,latest, 32,64, windows-2022)	1m 36s
posix (gcc-6, 03,11,14,1z, ubuntu-18.04, g++-6)	1s
windows (gcc, 03,11,14,17,2a, 64, windows-2019)	1m 54s
posix (gcc-7, 03,11,14,17, ubuntu-18.04)	1s
posix (gcc-8, 03,11,14,17,2a, ubuntu-18.04, g++-8)	1s
posix (gcc-9, 03,11,14,17,2a, ubuntu-18.04)	1s
posix (gcc-10, 03,11,14,17,2a, ubuntu-20.04, g++-10)	1m 9s
posix (gcc-11, 03,11,14,17,2a, ubuntu-20.04, g++-11)	4s
posix (clang, clang++-3.9, 03,11,14, ubuntu-18.04, clang-3.9)	1s
posix (clang, clang++-4.0, 03,11,14, ubuntu-18.04, clang-4.0)	1s
posix (clang, clang++-5.0, 03,11,14,1z, ubuntu-18.04, clang-5.0)	1s
posix (clang, clang++-6.0, 03,11,14,17, ubuntu-18.04, clang-6.0)	1s
posix (clang, clang++-7, 03,11,14,17, ubuntu-18.04, clang-7)	1s
posix (clang, clang++-8, 03,11,14,17, ubuntu-20.04, clang-8)	1m 15s
posix (clang, clang++-9, 03,11,14,17,2a, ubuntu-20.04, clang-9)	1m 22s
posix (clang, clang++-10, 03,11,14,17,2a, ubuntu-20.04, clang-10)	1m 7s
posix (clang, clang++-11, 03,11,14,17,2a, ubuntu-20.04, clang-11)	52s
posix (clang, clang++-12, 03,11,14,17,2a, ubuntu-20.04, clang-12)	54s
posix (clang, 03,11,14,17,2a, macos-10.15)	1s
	12m 42s

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