Time to say goodbye to `fmt`

1. [Change] Replace fmt::format() with std::format()
2. [Change] To -std=c++23

[Change] Fetch content of dependent `bux` with fixed tag 1.6.5 while it still can.

1.0.3

[Change] Fetch content of dependent `bux` with fixed tag 1.6.5 while …

[Bug] Build fails when `FETCH_DEPENDEES` is defined in `CMakeLists.txt` (Main use case: AUR build)

1.0.2

Update `README.md`

No fetch from bux by default

When building is triggered by package manager (AUR, vcpkg, ...), invoking FetchContent directives are not necessary or even causing directory conflict(s)

The first release

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