Change SystemIOWindows.PathGetFullPath() to convert forward
slashes to backslashes.
Change Duplicati.UnitTest.BasicSetupHelper.ZipFileExtractToDirectory()
to rely on slash fix-ups.
Even in .NET 4.6.2
`System.IO.Compression.ZipFile.ExtractToDirectory()` cannot handle
long paths. Replace call to
`System.IO.Compression.ZipFile.ExtractToDirectory()` with an
equivalent that extracts files to a temporary location and uses I/O
functions that support long paths to move them to their final
location.
In CommandLineOperationsTests.cs, use ISystemIO functions to handle
potentially long paths.
Add a fix to RecoveryTool for long paths that was missed by #4258.
This fixes#3863.
Fix pull request string comparisons in SystemIOWindows.cs to use
StringComparison.Ordinal.
Fix pull request to use SystemIO.IO_WIN.PathCombine() in
WindowsSnapshot.cs.
Allow historically problematic Windows paths (i.e., files or
directories that end in a dot or a space) to be backed up with
Duplicati in Windows.
This fixes#3839.
Dean Ferreyra