Magnum/EigenIntegration/ directory new in 2019.10

Namespace Magnum::EigenIntegration.

Files

file DynamicMatrixIntegration.h new in Git master
Conversion of Eigen dynamically sized matrix types.
file GeometryIntegration.h new in 2019.10
Conversion of Eigen geometry types.
file Integration.h new in 2019.10
Conversion of Eigen array and matrix types.