This automatizes the generation of logging categories so a
kdeconnect-kde.categories is generated and installed to
/usr/share/qlogging-categories5/ so kdebugsettings can use it.
Also, sets the default logging level to Warning. So now the logs
of users won't be filled with debug messages but they can
modify the configuration easily with kdebugsettings.
Summary: I've added Windows support to the systemvolume plugin.
Test Plan: Move the volume sliders in the Android app
Reviewers: kdeconnect, #kde_connect, albertvaka
Reviewed By: #kde_connect, albertvaka
Subscribers: albertvaka, kdeconnect
Tags: #kde_connect, #windows
Maniphest Tasks: T10000
Differential Revision: https://phabricator.kde.org/D16936
