* tests: migrate deprecated std::is_trivial_v

* tools: add python typings

* build: support meson build system

CMake feature parity:
- [x] Export meson target
- [x] Export meson c++20 modules target
- [ ] Export cmake target
- [x] Installing headers
- [x] Googletest support
- [x] Freestanding tests
- [x] Modules tests
- [x] Google Benchmark support
- [x] Extract examples from docs

Extra features:
- [x] Export pkgconfig target
- [x] clang-format support
- [x] Make fmtlib optional when building examples
- [x] Install documents to docdir

Tested on Fedora Linux 44 (gcc/clang/msvc-wine + ninja) and Windows 10 22H2 (msvc + vs2022).

* ci: fix shellcheck warnings

* ci: add meson tests

* style: run clang-format

* ci: workaround clang sanitizer linking bug

* build/meson: fix modules builds on mingw winpthreads

* build/meson: do not link -nodefaultlibs on sanitized builds

* build/meson: increase max object section count on msvc

* ci: only test release builds, do not run benchmarks

* ci: pin runner versions

* ci: exclude unsupported / broken platforms

* build: add a notice about clang-cl broken msvc compatibility

* build: meson gtest autodiscovery

* build: meson doctest autoglob

* ci: manage meson builds from proxy-ci

* build: meson benchmarks autogen

* build: make meson use common doctest extract logic

* build/meson: auto disable tests if in a subproject

* build/meson: auto disable benchmarks if in a subproject

* build/meson: remove docdir installation

the glob only contains files with C++ source code now.

* build/meson: remove all autogen

* build/meson: only add WINPTHREAD_COND_DECL workaround if winpthreads is found

* ci: reword step names

* ci: move meson ci tests into bvt workflows

* build/meson: support pgi compilers

* ci: remove meson from compatibility tests

* ci: run meson and cmake in one pass

* Test for std::format using __cpp_lib_format

With specialization for libc++. Fixes compilation on libc++ 16-18 that
has incomplete std::format support.

* build/meson: remove module support

too many compiler-specific workarounds.
waiting for better upstream support.

* fixup! ci: add meson tests

* fixup! Test for std::format using __cpp_lib_format

* build/meson: add test and benchmarks to all targets, only test build benchmark on ci

* fixup! Test for std::format using __cpp_lib_format

* fixup! build/meson: add test and benchmarks to all targets, only test build benchmark on ci

* fixup! build/meson: add test and benchmarks to all targets, only test build benchmark on ci

* build/meson: update fmt to 12.1.0

* fixup! tools: add python typings

* fixup! build/meson: remove all autogen

* Update copyright

* Update license

…eturning overloads (#13)

* Fix explicit_conversion_dispatch and weak_dispatch for reference-returning overloads

* Resolve comments