espalarm Code

Remove experimental stuff (replacing the Bodmer oled stuff - given up).

Add sample json configuration file (to be uploaded to the device as /fs/config.json).

Reduce some verbosity, get FTP server to report node name

Doc update

Remove dependency on libraries/TimeLib

Removing old info from secrets.h.sample

Moving away from hardcoded config, using a JSON file on local (LittleFS) storage.
Reading the sensor list from that as well (instead of hardcoding).
Use new API to tell the DynDNS library which provider to use.

Save a couple of KB on image size for error messages

Remove accidental addition

Fix authentication, make it suitable for this use case