RFC: switch Windows to UTF-8 locale entirely

[kmilos]

See https://learn.microsoft.com/en-us/windows/apps/design/globalizing/use-utf8-code-page

This should make Windows behaviour almost identical to *nix w.r.t UTF-8 everywhere.

NB: bumps minimum requirement to Windows 10 1903 (w/ 5th gen Broadwell HW cca 2015 and later as well).

TBD if this is for 4.8 or some future dt version, but the switch will address e.g. Exiv2 dropping wstring (other libs might follow at some point) and make L10N easier in the long run...

There's probably a few more places to check for wchar_t and -W API, and also double-check how CLI arguments are handled and if anything needs to change there (currently wmain wrapper and conversions are left in place).

Testers and feedback are welcome.

[wpferguson]

I wonder how many users are still on Win 7,8,8.1?

[kmilos]

Depends on what source you use, but most estimates are tiny, in the 1% range:

https://gs.statcounter.com/os-version-market-share/windows/desktop/worldwide

https://www.pcbenchmarks.net/os-marketshare.html

In any case, this change doesn't seem to be working yet (at least for the CLI), so still some work to do...

[github-actions]

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[kmilos]

@jsmucr Please test w/ exiv2 0.28 if you get a chance.

[kmilos]

Due to LibRaw/LibRaw#632, this also requires the patched 0.21.2-3 MSYS2 package (or later, and -DDONT_USE_INTERNAL_LIBRAW=ON of course).

If a new/fixed LibRaw submodule is not available upstream if/when this is to be merged, we can always switch only imageio_libraw.c back to wchat_t API.

[github-actions]

This pull request has been marked as stale due to inactivity for the last 60 days. It will be automatically closed in 300 days if no update occurs. Please verify it has no conflicts with the master branch and rebase if needed. Mention it now if you need help or give permission to other people to finish your work.

[github-actions]

This pull request has been marked as stale due to inactivity for the last 60 days. It will be automatically closed in 300 days if no update occurs. Please verify it has no conflicts with the master branch and rebase if needed. Mention it now if you need help or give permission to other people to finish your work.