Expose number of timeout snoozes & maximum number of timeout snoozes to QML

This PR targets update 3, do not merge until landing for update 3 is on.

Expose number of timeout snoozes & maximum number of timeout snoozes to QML.

Corresponding timed functionality is implemented by https://github.com/nemomobile/timed/pull/48, do not merge this pull request before the timed pull request is merged.