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Add ui button for `gui/sitemap` #5658

Job	Run time
docs / Build linux64	1m 17s
lint / lint	22s
test / Linux gcc-10 / Build linux64	1m 22s
test / Linux gcc-12 / Build linux64	1m 26s
test / Windows MSVC / Build win64	4m 42s
test / Run Linux test suite (gcc-12, all plugins) / Test (ubuntu, gcc-12, all plugins, default config)	1m 52s
test / Run Linux test suite / Test (ubuntu, gcc-10, default plugins, default config)	51s
test / Run Windows test suite (empty config) / Test (windows, msvc, default plugins, empty config)	1m 9s
test / Run Windows test suite / Test (windows, msvc, default plugins, default config)	55s
	13m 56s

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