D25077: Use compile time checked connect

[Benjamin Port]

bport accepted this revision.

REPOSITORY
  R296 KDeclarative

REVISION DETAIL
  https://phabricator.kde.org/D25077

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