Correction for absorption in Sample material
This implements a correction for the absorption in the sample material. External libraries have been researched to see how much they could help with this issue, like for example vtk
The geometry of the sample will need to be read from an external data file into Steca. These files will be use the *.stl file format. The implementation of absorption will be handled by ourselves without using an external library. Users also asked for the implementation of a sample visualization. For this 3d rendering capabilities are necessary which so far have not been used in Steca. After some research it has been decided to use Qt6 rd rendering. It is good in quality and performance.
For the absorption additional math operation are necessary which are not covered by the current vector and matrix structures. Issue 107 will take care of this. So this issue can concentrate on the correction for material absorption.