176 merge toolbox and cases components

[ ] Have you checked to ensure there aren't other open Pull Requests for the same change?
[ ] Have you fixed a Bug ?
[ ] Have you added the documentation of the example or benchmark ?
[ ] Have you successfully run the example or benchmark?
[ ] Have you documented the results?
[ ] Have you added the images to the documentation?
[ ] Have you added the vtkjs files for 3D visualization in the documentation?
[ ] Have you added the vtkjs files to a Data Management Plateform e.g https://girder.math.unistra.fr

feelpp / toolbox