D7940: plugin loaded by kirigami to use KColorScheme and KIconLoader

[Marco Martin]

mart added reviewers: Plasma, Kirigami, hein.

REPOSITORY
  R135 Integration for Qt applications in Plasma
REVISION DETAIL
  https://phabricator.kde.org/D7940

To: mart, #plasma, #kirigami, hein
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, 
abetts, sebas, apol, mart