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Add `machine-toggle` tool #6368

Job	Run time
lint / lint	15s
docs / Build linux64	1m 21s
test / Windows MSVC / Build win64	17m 41s
test / Linux gcc-11 / Build linux64	4m 21s
test / Linux gcc-12 / Build linux64	6m 51s
test / Run Linux test suite / Test (ubuntu, gcc-11, default plugins, default config)	46s
test / Run Linux test suite (gcc-12, all plugins) / Test (ubuntu, gcc-12, all plugins, default config)	57s
test / Run Windows test suite / Test (windows, msvc, default plugins, default config)	1m 10s
test / Run Windows test suite (empty config) / Test (windows, msvc, default plugins, empty config)	1m 4s
	34m 26s

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