recent-view: Integrate recent view in the shell

Given the restrictions of GtkHeaderBar for reparenting, we must
implement multiple modes for the toolbar, which can be customized
for Recent View, Full Screen, and Document (normal).

https://bugzilla.gnome.org/show_bug.cgi?id=633501
Rename ev_application_open_window as ev_application_open_recent_view
recent-view: Remove the scrolled window shadow