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: Added primitive support for the mpriscontrol plugin on Windows by simulating VK_MEDIA key presses. I took a look into `ISystemMediaTransportControls`, but there doesn't seem to query it since it's per app. Leaving simulating key presses our only option for now. Completes T10000
Reviewers: kdeconnect, #kde_connect, albertvaka
Reviewed By: #kde_connect, albertvaka
Subscribers: albertvaka
Tags: #kde_connect, #windows
Maniphest Tasks: T10000
Differential Revision: https://phabricator.kde.org/D17702
