WiFi: Support for hidden networks and misc fixes. #1092

Job	Run time
compile-examples (arduino:mbed:nano33ble)	7m 46s
compile-examples (arduino:mbed:envie_m7)	17m 19s
compile-examples (arduino:mbed:nanorp2040connect)	12m 50s
compile-examples (arduino:mbed:nicla_sense)	7m 22s
compile-examples (arduino:mbed:nicla_vision)	12m 52s
compile-examples (arduino:mbed:opta)	15m 49s
compile-examples (arduino:mbed:giga)	24m 5s
compile-examples (arduino:mbed:nicla_voice)	5m 26s
compile-examples (arduino:mbed:edge_control)	5m 57s
compile-examples (arduino:mbed:envie_m7:target_core=cm4, - libraries/KernelDebug - libraries/Port...	4m 23s
	1h 53m 49s

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