[connman-qt] Add // @uri comment for Qt Creator.
[connman-qt] Change property values prior to emitting signals.
[connman-qt] Remove dead code.
[connman-qt] Change to 64 bit type for data counters.

32 bit unsigned types are not adequate for data counters as they will
wrap after 4GB. Switch to using 64 bit unsigned types.

This changes the API/ABI.
Merge pull request #99 from amccarthy/data-counters

Data counters