52cfd36b09
In order to add a toolbar with a back button in settings I needed to extend from a fragment so I converted SettingsFragment into a fragment and created SettingsContainerFragment, the latter is injected as a child of SettingsFragment inside a FrameLayout. Since SettingsContainerFragment extends from PreferenceFragmentCompat, this allows to swap it for other and, in the bigger picture, allow an arbitrary organization.