utils: Add activateAction function

https://bugzilla.gnome.org/show_bug.cgi?id=728117
Add ShareDialog

Add the ShareDialog module, which includes sharing a place to
GNOME Weather and GNOME Clocks.

https://bugzilla.gnome.org/show_bug.cgi?id=728117
MapBubble: Add share button

https://bugzilla.gnome.org/show_bug.cgi?id=728117
Add share button to userLocation and searchResult

https://bugzilla.gnome.org/show_bug.cgi?id=728117