changes to support msvc builds with qt6

[jef-n]

No description provided.

[github-actions]

🪟 Windows builds ready!

Windows builds of this PR are available for testing here. Debug symbols for this build are available here.

(Built from commit ce3f743)

[MehdiChinoune]

I tried before to fix building against Qt6 on Windows by using ANSI *A functions in #52175 but It was rejected, I was ordered to use UNICODE *W functions.
@m-kuhn

[m-kuhn]

I was hoping we could switch to unicode, see #56841

[m-kuhn]

Should probably not be added, #56980 should fix this

[m-kuhn]

Looks good, but I think we should start using the Widechar version now that we are touching this code and Qt made this the standard with Qt6

[github-actions]

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