D28460: Add KCModuleStateProbe as base class for plugin

[Benjamin Port]

bport marked 10 inline comments as done.

REPOSITORY
  R295 KCMUtils

REVISION DETAIL
  https://phabricator.kde.org/D28460

To: bport, #plasma, ervin
Cc: broulik, kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, 
bruns