examples: Rename raw_meas to measurement

Also applies correct JSON NDJ format.

Change-Id: I51ad91f7f18268b81b8c63edce8521665619fc10
Use " instead of ' for valid JSON

Parser only "like" this way :-)

Change-Id: I282c7835b88b34c43837a5a50a8f386b058d6ae1
Describe NDJ as a valid possibility for wire protocols

Change-Id: I4ca904b5e61a3aa704b035dc34ea0a22c9300178
Improve and correct message specification

* List of valid abbreviations and full names in example
* Correct ABNF syntax
* Extended time representation

Change-Id: I0001d5c563e37d4081efbfcff1d546ab5e911883
Use JSON Schema to define supported messages in consumers of messages

Change-Id: I588ca773bf7f44a4a8a10f209c4d25f71bbd1d30