Added CmpSparkPlugB Logger
Added WriteDeviceLog function to add a SparkPlugB Log function: FB_EoN_Node, FB_Client_Mqtt will use it to log the current connection state etc (see it as a console/stdout)
Phased out FB_Client_Mqtt for FB_MQTT_PubSub
Added/modified various FB_EoN_Node methods
Added/modified FB_STATE_Change