serre SVN

Add (code to get and share) IP address info in several places.

Small updates

Get JSON as query format also, use ArduinoJson to read

Handle simple queries from the app.
Make sure to always return json, also in error messages, from the json handler.

Allow Android app to query a bunch of things in one go, result in JSON format.

Small changes

Initialize new field properly

Don't call realloc on every message.
Keep separate variables for buffer length and message length for that.
Fix bug with clearing previous buffer content.
Reduce logging somewhat.

Close the client on any error, hoping it recovers better.

Move CloudMessaging.cpp into a component structure.