xlnt-community / xlnt / 87a7c5f7-b7c6-4b73-a255-d77bb95072d4

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Add detection for C++26 (#149)

This PR adds detection for C++26, as it has now been officially
approved.

This also allows using C23 functionality if XLNT is compiled as C++26.
For now, this effectively means that `xlnt::detail::localtime_safe` and
`xlnt::detail::gmtime_safe` now can internally use `localtime_r` and
`gmtime_r` even on systems that are not POSIX-compatible (or can be used
due to any of the other feature test macros from
[`localtime_r`](https://linux.die.net/man/3/localtime_r) and
[`gmtime_r`](https://linux.die.net/man/3/gmtime_r)) as long as XLNT is
compiled as C++26.

For the sake of completeness: I did not remove XLNT's CMake warning that
the support for C++26 is still experimental. This is because no compiler
yet has full support for C++26, so I would consider our support to be
experimental until then.

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