refactor Visual Studio file importing #1389

Job	Run time
build (asan, -DANALYZE_ADDRESS=On, true, process, false)	15m 59s
build (tsan, -DANALYZE_THREAD=On, false, thread, false, --executor=thread --error-exitcode=0)	18m 16s
build (ubsan, -DANALYZE_UNDEFINED=On, true, process, true)	57m 56s
	1h 32m 11s

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