Summary: Implements T12895. Might include things like bluetooth and usb tethering in the future when implemented

Test Plan: Edit SSID and password, start, connect

Reviewers: #vdg, jgrulich, nicolasfella, cblack

Reviewed By: #vdg, jgrulich, nicolasfella, cblack

Subscribers: cblack, nicolasfella, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D29019