New pot_extrator method to i18n module #17004

Job	Run time
Arch / PyPy	20m 23s
Arch Linux	19m 55s
CUDA (on Arch)	7m 25s
Ubuntu Rolling (gcc, g++)	20m 35s
Fedora	18m 5s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	14m 22s
Gentoo	23m 47s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	14m 30s
OpenSUSE	16m 39s
Ubuntu Bionic	15m 29s
Ubuntu Rolling (clang, clang++)	23m 0s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	15m 32s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	13m 47s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	14m 3s
	3h 57m 32s

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