Merge pull request #711 from SignalK/const_ref_set #1187

Job	Run time
build (examples/minimal_app.cpp, esp32dev)	1m 19s
build (examples/analog_input.cpp, esp32dev)	1m 25s
build (examples/hysteresis.cpp, esp32dev)	1m 14s
build (examples/lambda_transform.cpp, esp32dev)	1m 15s
build (examples/manual_networking.cpp, esp32dev)	1m 19s
build (examples/minimal_app.cpp, esp32dev)	1m 15s
build (examples/relay_control.cpp, esp32dev)	1m 23s
build (examples/rpm_counter.cpp, esp32dev)	1m 18s
build (examples/async_repeat_sensor.cpp, esp32dev)	1m 17s
build (examples/repeat_sensor_analog_input.cpp, esp32dev)	1m 14s
build (examples/freertos_tasks.cpp, esp32dev)	1m 20s
build (examples/raw_json.cpp, esp32dev)	1m 16s
build (examples/constant_sensor.cpp, esp32dev)	1m 28s
build (examples/time_counter.cpp, esp32dev)	1m 21s
	18m 24s

Provide feedback