D5127: Switch to newer KDevelop API

[Friedrich W. H. Kossebau]

kossebau removed a reviewer: kossebau.

REPOSITORY
  R118 Plasma SDK

REVISION DETAIL
  https://phabricator.kde.org/D5127

To: jriddell, #plasma
Cc: plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, 
sebas, apol