logging.cc with global log_verbosity variable #14

Job	Run time
formatting	25s
doc	42s
build (MacOS Release, clang++, clang, Release, -stdlib=libc++, macos-latest)	37s
build (GCC 12 Release, g++-12, gcc-12, Release, ubuntu-24.04)	1m 10s
build (GCC 12 Release, g++-12, gcc-12, Release, ubuntu-24.04)	1m 1s
build (GCC 12 Debug, g++-12, gcc-12, Debug, ubuntu-24.04)	1m 5s
build (Clang 18 Release, clang++-18, clang-18, Release, -stdlib=libc++, -lc++abi, ubuntu-24.04)	1m 28s
build (Clang Tidy, clang++-18, clang-18, Debug, -stdlib=libc++, -lc++abi, true, ubuntu-24.04)	2m 1s
build (GCC 12 Sanitizer, g++-12, gcc-12, Release, -fsanitize=address,undefined -fno-omit-frame-po...	3m 27s
	11m 56s

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