Refactor option getting v2 #16937

Job	Run time
Arch / PyPy	19m 48s
Arch Linux	20m 31s
Ubuntu Rolling (gcc, g++)	20m 3s
CUDA (on Arch)	7m 15s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	13m 47s
Fedora	17m 37s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	14m 1s
Gentoo	21m 59s
OpenSUSE	16m 36s
Ubuntu Rolling (clang, clang++)	22m 10s
Ubuntu Bionic	15m 8s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	15m 22s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	13m 15s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	13m 56s
	3h 51m 28s

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