[ownCloud] Rewrite the wizard in QML
As it turns out, the plasma-settings app is unable to load QWidget-based plugin UIs, so this needs to be in QML. It's not yet perfect and should most probably be rewritten to use StackView instead of a simple Loader, but for now it works. The original QWidgets code is kept in place, ideally there should be a detection of the env and show either QML (on the phone) or the QWidgets (desktop) UI.
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