D7879: [KConfigGroup] reserve() more and add some C++11

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: kde-frameworks-devel, dfaure.
Restricted Application added a project: Frameworks.
Restricted Application added a subscriber: Frameworks.

REVISION SUMMARY
  Using initializer_lists for QList we reserve the right amount of memory in advance and also make for nicer code.
  Also uses range-for where code as touched and a const container was used.

TEST PLAN
  Test still pass.
  
  `asRealList` is called 4200x on plasmashell startup for me, saves 2ms for me

REPOSITORY
  R237 KConfig

REVISION DETAIL
  https://phabricator.kde.org/D7879

AFFECTED FILES
  src/core/kconfiggroup.cpp

To: broulik, kde-frameworks-devel, dfaure
Cc: #frameworks
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