D26491: [Plasma Quick] Add WaylandIntegration class

[Vlad Zahorodnii]

zzag added a task: T12496: Shadows API in KWindowSystem.

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D26491

To: zzag, #plasma
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns