EnviroDIY/ModularSensors: More agressive attempts to set clock

Improvements: Much more aggressive attempts to set the clock if the time is not reasonable - before 01Sep2019 or after 01Jan2025. The LED will flicker and warnings will be sent over the serial port for invalid times at every check. The logDataAndPublish function will attempt to synchronize the clock at every measurement until a valid time is received. The NIST sync will attempt to open the socket to the daytime server up to 12 times trying to get a valid response. Using automatic network technology and carrier profile for LTE XBee3's - with the current firmware there is not a significant time savings in manually selecting the carrier and manually selecting the carrier gives no options when the relative signal strength of the carriers changes