Merge pull request #784 from SignalK/config_field_description #1381

Job	Run time
build (examples/minimal_app.cpp, esp32dev)	1m 16s
build (examples/analog_input.cpp, esp32dev)	1m 46s
build (examples/hysteresis.cpp, esp32dev)	1m 44s
build (examples/lambda_transform.cpp, esp32dev)	1m 43s
build (examples/manual_networking.cpp, esp32dev)	1m 24s
build (examples/minimal_app.cpp, esp32dev)	1m 25s
build (examples/relay_control.cpp, esp32dev)	1m 24s
build (examples/rpm_counter.cpp, esp32dev)	1m 31s
build (examples/async_repeat_sensor.cpp, esp32dev)	1m 46s
build (examples/repeat_sensor_analog_input.cpp, esp32dev)	1m 24s
build (examples/freertos_tasks.cpp, esp32dev)	1m 44s
build (examples/raw_json.cpp, esp32dev)	1m 24s
build (examples/constant_sensor.cpp, esp32dev)	1m 47s
build (examples/time_counter.cpp, esp32dev)	1m 30s
	21m 48s

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