Warning Roundup

Summary:

• Clean all warnings in project.
• Style adjust for non conformed file
• Set Version to 0.70.0 to reflect Prerelease status (from 1.0.0)

Reviewers: tcanabrava, patrickelectric, laysrodrigues, leandrosantiago

Reviewed By: tcanabrava, patrickelectric, laysrodrigues

Subscribers: Atelier: General Development

Tags: Atelier: General Development

Differential Revision: https://phabricator.kde.org/D15858