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* Split didPush() into didPush() and install(), so that we can install the overlays without triggering the push logic. This will be used in a subsequent patch to implement route replacement. * Split didPop() into didPop() and dispose(), so that we can remove overlays without triggering the pop logic. Also for a subsequent patch that implements replacement. * Clean up _navigator on the routes when the Navigator itself is disposed. * Drop the forwarding logic on willPushNext() -- now didPushNext() -- and didPopNext(), since we no longer have StateRoutes to get in the way. * Implement isCurrent more broadly and without having to keep track of state. * Provide some toString()s on NamedRouteSettings and ModalRoutes. * Make OverlayState.initState() use the insertAl functionality. * Make OverlayRoute.builders abstract since that way you'll catch when you forget to do it. If you don't want overlays, don't inherit from this class. * Made handleStatusChanged() on TransitionRoute public so that it can be overridden by subclasses.