Refactored RigGridBase::cellCornerVertices to return std::array<cvf::Vec3d, 8> by value instead of taking a reference to std::array as an output parameter. This change improves code readability and leverages modern C++ return value optimizations.
Updated all call sites across the codebase to reflect the new function signature.
* Avoid ambiguous definition during unity build on Windows
* Add missing include
* Add Qt6 to expressionparser
* Add Qt6 to nightcharts
* Replace forward define of QStringList with include <QStringList>
* Use toMSecsSinceEpoch
* Use setContentsMargins