Simplify Temperature Object
Summary:
Remove public methods that clients should not use
Create a protected resetData method for unittests
Reviewers: tcanabrava, patrickelectric, laysrodrigues
Reviewed By: patrickelectric, laysrodrigues
Subscribers: Atelier: AtCore
Tags: Atelier: AtCore
Differential Revision: https://phabricator.kde.org/D18874