Before next major release, we need to update our renderer settings to use DirectX11 (and maybe DirectX12 where available) instead of OpenGL. As now with Qt6 it's the default option, we need to adapt our custom renderer-selection code to make use of it.

This should allow to ship GCompris with GPU acceleration on the windows store (it is currently shipped with software renderer there, as the mandatory OpenGL dependency was not accepted when it was reviewed for publication in the store...). And it should globally make the experience better on this OS (as OpenGL drivers on windows are known to not always be reliable, if at all available).

See:
https://doc.qt.io/qt-6/qquickwindow.html#setGraphicsApi
https://doc.qt.io/qt-6/qsgrendererinterface.html#GraphicsApi-enum