D21901: Calendar events: allow plugins to show event details

[Daniel Vrátil]

dvratil added a reviewer: mart.

REPOSITORY
  R296 KDeclarative

REVISION DETAIL
  https://phabricator.kde.org/D21901

To: dvratil, #frameworks, mart
Cc: kde-frameworks-devel, LeGast00n, michaelh, ngraham, bruns