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This commit adds a locationInToolbar KToggleAction to switch between using a location bar to navigate or using a new custom QWidgetAction in the toolbar. A big portion of this MR is refactoring because until now the UrlNavigator was tightly intertwined with the DolphinViewContainer. With this MR an UrlNavigator for controlling a View can be freely connected or disconnected with a single method call. A DolphinUrlNavigator class is created in the process which contains all Dolphin-specific UrlNavigator code which did previously reside in the DolphinViewContainer class. Other application parts that belong to UrlNavigator-management are also moved here.
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