refactor Visual Studio file importing #1430

Job	Run time
build (tsan, -DANALYZE_THREAD=On, false, thread, false, --executor=thread --error-exitcode=0)	13m 41s
build (ubsan, -DANALYZE_UNDEFINED=On, true, process, true)	56m 22s
build (asan, -DANALYZE_ADDRESS=On, true, process, false)	15m 24s
	1h 25m 27s

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