* quick and dirty WIP to investigate timezones, currently only building under esp8266 platform
much of the status stuff has been stripped for now, to test the concepts
* support set of common features across ESP32/ESP8266 WRT timezone and sntp
return dates as ISO format strings
* remove time library, and timelib fix which is no longer required
* fix the icons
* remove temporary changes to demo project
Adds a webpack plugin to package interface as PROGMEM into a header file in the framework.
Adds a build flag to optionally enable serving from PROGMEM or SPIFFS as required
Adds documentation changes to describe changes
rjwats