Cli skeleton

This provides a skeleton of the CLI. It is creating a `ProjectData` object and that's all for now.
Next steps shall include setup of processes, calling global assembly, and solving the resulting system of linear equations.
It seems, one does not need this. So removed.
But still in the Project.h GEOModels are included and none of the CMake's link to qt, which is used in GEOModels directly.
@bilke What do I oversee?