[cuttlefish] Bind StandardKey.Quit (Ctrl+Q) to exit the app

Authored by Zren on Oct 30 2018, 5:47 PM.

Description

[cuttlefish] Bind StandardKey.Quit (Ctrl+Q) to exit the app

QML Shortcut requires Qt 5.5, so we bumped QtQuick to 2.5.

Differential Revision: https://phabricator.kde.org/D16521

Details