D8444: WIP: Define default Action when we plug unknown monitor

[Laurent Montel]

mlaurent added a subscriber: dvratil.

REPOSITORY
  R104 KScreen

REVISION DETAIL
  https://phabricator.kde.org/D8444

To: mlaurent
Cc: dvratil, davidedmundson, ngraham, plasma-devel, ZrenBot, progwolff, 
lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart