Summary: Improve contact matching by checking if the requested address ends with a candidate phone number, or vice-versa

Test Plan:
Check that *all* conversations which correspond to a contact are matched
 - All of mine match. If someone finds one which doesn't, I will need the particulars...

Reviewers: #kde_connect, nicolasfella

Reviewed By: #kde_connect, nicolasfella

Subscribers: nicolasfella, kdeconnect

Tags: #kde_connect

Differential Revision: https://phabricator.kde.org/D15992