Make ESP8266 use LittleFS instead of deprecated SPIFFS
Make framework use the correct filesystem automatically and handle the call the FS.begin()
Change default MQTT keepalive to 60 seconds
Fix lodash security issue
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
Removed css from compression plugin - using CSS-in-JS in app
Introduce favicon - add mapping for favicon.ico, was previously sending html response for requests for the favicon
