espalarm Code

More work to get 2nd display window to work.

Initial code for multiscreen (a home screen and one with a keypad, and less clock/weather info).

Add instrumentation (fetching images takes too long).
Close MQTT only if non-null pointer.

Stop MQTT component after network disconnect

Improve handling network connection loss

Add Network(dis)connected methods

Config : a field not initialized properly resulted in unpredictable behaviour for unknown nodes.
Alarm : only issue an error if no button but we do have an Oled.

Query MAC address and pass to Config before getting a WiFi connection.

Convert some more code away from IPAddress specific (stopped working after a previous change).
Simplify some of the JSON handling.

Remove some dead code.
Apparently we need to allocate more memory, unsure why but this avoids crashes in the GIF code.