D17588: MainWindow: Add Frameless configuration

[Kurt Hindenburg]

hindenburg added reviewers: Konsole, hindenburg.

REPOSITORY
  R319 Konsole

REVISION DETAIL
  https://phabricator.kde.org/D17588

To: patrickelectric, #konsole, hindenburg
Cc: tcanabrava, konsole-devel, thsurrel, ngraham, maximilianocuria, hindenburg
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