espalarm Code

Support more than one config file, for e.g. a whitelist.json global to all nodes.
This requires changes to Config::ParseConfig so it doesn't always reinitialize.
The security configuration allows distinction between OTA and other nodes (read : not every IP or MAC address can flash our nodes).

Work with newest v3.3.5 esp-idf

An additional configuration item to allow nonstandard (other than 443) https ports.
WebServer : disabling http as a fallback is a bad idea, it's a requirement to kickstart ACME.

Hmm

Reduce memory allocation (64K is too much for our target) so ftp doesn't randomy appear to fail.
Introduce a server side error message, doens't appear to interrupt standard ftp clients though.

Handle the different situations slightly better.
Allow to specify not to fallback to http.

Add documenation, and small changes

Set up a https server based on ACME credentials

Provide for longer configuration files

Bugfix: return after lodepng error