Word Clock based on LED Matrix

The layout of the letters was inspired by https://github.com/brettoliver/wordclock but the underlying code and construction is different.

I have made a few versions of this over the past few years and I though I should release it as I've moved on to other projects.

Previous versions included a real time clock (RTC), but this release has code that produces web page that allows you to configure various clock parameters, including your wifi details. Once saved it will reboot and show the correct time (hopefully) after synchronising itself with an internet clock.

In previous versions without the web interface I controlled options via a single switch on a printed circuit board that held the wemos D1 mini the RTC and the switch. In this version it isn't necessary to have the pcb or RTC, but the switch is handy as if held in for 5-10 seconds, it causes the wifi credentials to be reset, which means on the next reboot you can change clock parameters - think factory reset button - this