[2018-12] [corlib] Import FileSystemInfo and family from CoreFX #11963
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Includes the following from System.IO:
Join()
Span APIand all of System.IO.Enumeration namespace.
Adds about 1600 System.IO tests
Behavior changes:
File.Replace
now replaces files even if they are read-only (using therename
syscall on Unix)Issues:
Part of #7246
Backport of #11342.
/cc @alexischr