Drop obsolete members after release v0.20.0
Extract FetchOptionsBase and extend Clone tests
Allman all the way
Add TransferProgress.DebuggerDisplay
Unify copying of native dependencies
Rename CopyNativeDependencies.targets as CopyWindowsNativeDependencies.targets
Only deploy Windows native libraries on Windows

Fix #813
Introduce PathSpec for StatusOptions.
Introduce StatusOptions.DisablePathSpecMatch