Ian Tindale / Mbed 2 deprecated SPIVFDclock

Driving a 20T202DA2JA VFD, using the (powered) RTC, pressing a button to ask the user to enter the date details over serial, displaying the date on the VFD. Now with added ethernet and NTP to update the time automatically on startup.

Dependencies:   EthernetNetIf mbed DNSResolver NTPClientMin