Added messages SetAnalogPinValue and SetDigitalPinValue that can be send only to device. Make AnalogPinValue and DigitalPinValue that can be only received from device.

Make one messages that can be only send to device and others that can be only received from device (but do not mix).

Ping can be send to device and Pong can be received from device (not the other way).

Removed useless serializers and deserializers.

Blocked SparkantaClientTest.