Removed TemporaryPrinterControlWidget

Summary:
Signed-off-by: Lays Rodrigues <laysrodriguessilva@gmail.com>

Refactor of MainWindow

Removed all widgets and add new and old ones in a better
layout.

Signed-off-by: Lays Rodrigues <laysrodriguessilva@gmail.com>

Reviewers: rizzitello, patrickelectric, tcanabrava

Differential Revision: https://phabricator.kde.org/D4167