D19132: Update libs/widgets to c++11

[Carl Schwan]

ognarb added a reviewer: Calligra: 3.0.

REPOSITORY
  R8 Calligra

REVISION DETAIL
  https://phabricator.kde.org/D19132

To: ognarb, #calligra:_3.0
Cc: Calligra-Devel-list, dcaliste, cochise, vandenoever
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