Create a hotspot KCM for Plasma Mobile
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