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Report color scheme (light/dark)

Michael Weghorn requested to merge michaelweghorn/plasma-integration:michaelweghorn/report_colorscheme into master

Implement QPlatformTheme::colorScheme to report whether a light or dark color scheme is used.

This gets used by QApplication::styleHints()->colorScheme() [1] (introduced in Qt 5.6) to retrieve the current color scheme and is used e.g. by the Qt 6 variant of LibreOffice to select corresponding app colors (see LibreOffice bug report [2] that also has a minimum sample program to reproduce).

The logic is based on the one that xdg-desktop-portal-kde uses. [3]

[1] https://doc.qt.io/qt-6/qstylehints.html#colorScheme-prop [2] https://bugs.documentfoundation.org/show_bug.cgi?id=162003 [3] https://invent.kde.org/plasma/xdg-desktop-portal-kde/-/blob/d9e37b2cfce426a8dfe761bb821b9ae9d6e0c50a/src/settings.cpp#L252-266

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