[GraphView] right click menu updates [Gramps50] recreation (#201)

* rewrite right-click menu

* add bookmark menu

* spouse menu for family

* add methods to add menu and submenu

* add separators

* set busy cursor while building graph

* change 'Add spouse' to 'Add new family'

* fix busy cursor
if click on person without parents

* use signals in Action class

* try to fix popup
save popup menu in self.menu
call "popup" depending on gtk version