espalarm Code

Move the internet weather query to a background task.

Prepare for processing this call asynchronously : the program structure is right for this now,
so next step is to cut the flow in two in Peers.cpp .

Add build time, and a way to query it.
Code shuffles without functional changes.

Reduce dependency on Esp32-Arduino APIs

Move stuff in the NetworkConnected() call.

This is unreliable for now, document that.

Prevent against json == 0

Remove unused variable

Infrastructure to keep track of network status changes

Move the check for your own replies up, avoiding some copy operations