Add KCM for controlling KWin's Night Color module
Simple but powerful KCM utilizing LibColorCorrect from Plasma Workspace
to provide configuration of Night Color in KWin.
Reviewers: Plasma, davidedmundson
Reviewed By: Plasma, davidedmundson
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D5932