Refactor file layer #5109

Job	Run time
mingw (mingw64)	4m 3s
mingw (ucrt64)	3m 48s
build (windows-2019, Win32, v142, 17, Debug)	1m 8s
build (windows-2019, Win32, v142, 17, Release)	2m 5s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 18s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 29s
build (windows-2019, x64, v140, 14, Debug)	1m 37s
build (windows-2019, x64, v140, 14, Release)	1m 58s
build (windows-2019, x64, v141, 17, Debug)	1m 11s
build (windows-2019, x64, v141, 17, Release)	2m 42s
build (windows-2019, x64, v142, 17, Debug)	1m 7s
build (windows-2019, x64, v142, 17, Release)	2m 56s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 20s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	1m 53s
build (windows-2019, x64, v142, 20, Debug)	2m 37s
build (windows-2019, x64, v142, 20, Release)	2m 56s
build (windows-2022, x64, v143, Debug, 20)	1m 25s
	36m 33s

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