DO NOT MERGE YET: Fixes #3843, Action Bar: Secondary navigation tool?

- added an action provider that handles the long click and redirects to secondary default navigation

This would bring back the functionality as it was before, at the expense of loosing the normal long-press functionality.
Looking into the app again I found the second place I thought existed - NavigationAnyPointActivity. To be able to address both, an interface is in order, isn't it?