Improve command-line option handling #95

Job	Run time
linux_clang (ubuntu-latest, Debug)	3m 37s
linux_clang (ubuntu-latest, Release)	1m 31s
linux_gcc_valgrind	1m 13s
linux_gcc (ubuntu-latest, Debug)	4m 30s
linux_gcc_sanitizers	2m 31s
linux_gcc (ubuntu-latest, Release)	2m 10s
macos_clang (macos-latest, Debug)	5m 55s
windows_mingw64 (windows-latest, Debug)	5m 19s
macos_clang (macos-latest, Release)	1m 50s
windows_mingw64 (windows-latest, Release)	2m 47s
windows_msvc2022	2m 26s
	33m 49s

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