Summary:
Make it possible to trigger commands by opening an URI like kdeconnect://runcommand/<deviceid>/<commandid>
Makes it possible to trigger commands from NFC tags.
To ease the setup the url can be added to the clipboard

Test Plan:
Long-press a command entry
Select Copy URL to clipboard
Write into NFC tag or use kdeconnect-handler to trigger url
See command executing

Reviewers: #kde_connect, albertvaka

Reviewed By: #kde_connect, albertvaka

Subscribers: albertvaka, apol, kdeconnect, #kde_connect

Tags: #kde_connect

Differential Revision: https://phabricator.kde.org/D13447