Add new gsetting 'max-search-results'

https://bugzilla.gnome.org/show_bug.cgi?id=706635
SearchPopup: Add scrolled window

https://bugzilla.gnome.org/show_bug.cgi?id=706636
MainWindow: No need to reset model on SearchPopup

https://bugzilla.gnome.org/show_bug.cgi?id=706636
Add icons to search popup

https://bugzilla.gnome.org/show_bug.cgi?id=706715