Removed old/unused read_settings() interface #779

Job	Run time
tests (ubuntu-latest, tests)	32s
build (ubuntu-latest, noradio)	1m 52s
tests (macos-latest, tests)	28s
build (ubuntu-latest, wifi)	2m 17s
tests (windows-latest, tests_nosan)	1m 29s
build (ubuntu-latest, bt)	2m 6s
build (macos-latest, noradio)	1m 40s
build (macos-latest, wifi)	1m 41s
build (macos-latest, bt)	1m 40s
build (windows-latest, noradio)	3m 54s
build (windows-latest, wifi)	5m 35s
build (windows-latest, bt)	5m 6s
	28m 20s

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