QtSupport: Update feature set for Qt 5.7

Qt.labs.controls are replaced by QtQuick.Controls.2
QtQuick is bumped to 2.7

Change-Id: I317cc504171258b503455184fa6cc96c08deda5a
Reviewed-by: J-P Nurmi <jpnurmi@qt.io>
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>