D25433: KActionCollection: provide a changed() signal as a replacement for removed()

[David Faure]

dfaure added a dependent revision: D25434: [plasma-framework] port away from 
deprecated KF5 APIs.

REPOSITORY
  R263 KXmlGui

REVISION DETAIL
  https://phabricator.kde.org/D25433

To: dfaure, kossebau, mart, davidedmundson
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns