Add OpenGL warnings and make ANGLE default on Intel GPUs
Adds the ability to show some warning messages in the Display settings,
and also make ANGLE the default renderer with Intel graphics drivers.
This only affects Windows.
Maniphest Tasks: T7411
Differential Revision: https://phabricator.kde.org/D9435
(cherry picked from commit 8788c6ec00c007ba5578d428291ae4bd5582409e)