build: remove unused function argument
ContactPane: use popover in "new detail" button

Replaced old menu for actions. Now the code is cleaner
and easier to read.
misc: moved Center helper container to utilsc
ContactPane: removed unused signal callback

Hooked ContactPane::update_sheet directly into
Contact::*changed signal.
Removed show_matches parameters of update_sheet because
no one is actually using it.
ContactPane: migrated custom toolbar to ActionBar
ContactEditor: add properties for single value fields

The way properties are set is very fragile.
nickname property case is the worst of all, I'm almost sure
I will break this soon and I won't notice it.
ContactPane: hooked actions to Editor properties

Hooked actions for adding single value fields to the related
ContactEditor properties.
This prevent adding twice a birthday field for a contact.
ContactPane: remove debug instruction
build: add ContactFrame to translation

Fixed dist
Fixed: https://bugzilla.gnome.org/show_bug.cgi?id=727676