D9803: Apply some C++11 niceties, styling consistency

[Oleg Chernovskiy]

Kanedias marked 3 inline comments as done.

REPOSITORY
  R858 Qt Quick Controls 2: Desktop Style

REVISION DETAIL
  https://phabricator.kde.org/D9803

To: Kanedias, mart
Cc: apol, plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, mart
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