unc: use Windows API to handle shares

Using the wide char API allows handling pathes with non ANSI characters.

Using the native Windows API allows retrieving just the flags we want.

This should work in UWP apart from the network connection with the credentials.

Ref. #29076

changed milestone to %4.0

added Component::Input: network streams Platform::Windows desktop labels

added MRStatus::Reviewable label

added MRStatus::Accepted label and removed MRStatus::Reviewable label

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added 33 commits

• 391fe762...ea5b9725 - 32 commits from branch videolan:master
• fde35591 - unc: use Windows API to handle shares

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enabled an automatic merge when all merge checks for fde35591 pass

merged

mentioned in issue #29076