Import the address editor from kdepim-addons

Summary:
It's such a basic feature it shouldn't be an add-on. The main reason this
ended up in kdepim-addons was its dependency on WebEngine for the list
of addresses. That is a bit overkill and resulted in sub-optimal display
e.g. with dark color schemes. Therefore this part has now been replaced by
a regular item view widget.

Reviewers: mlaurent

Reviewed By: mlaurent

Subscribers: mlaurent, kde-pim

Tags: #kde_pim

Differential Revision: https://phabricator.kde.org/D25050