Moved Simulation::init() to Constructor, Simulation:free() to destructor and exchanged some members of Simulation with unique_ptr instances.

Added SG model to StressBC, added Timer-class which wraps existing timer in Simulation, added round-off correction in TurbulentViscosityCumulantK17CompChim_Device (testing ongoing)

for debugging

used https://kitware.github.io/vtk-examples/site/VTKFileFormats/ as guide

used https://kitware.github.io/vtk-examples/site/VTKFileFormats/ as guide

Not all sendNodes for communication after fine to coarse were found.
This was only a problem when cutting the domain in the z-direction.

pipeline #7663

Fix various msvc compiler warnings. With msvc the compiler flags are explicit passed to nvcc with -Xcompiler.

Change in cmake: When BUILDTYPE is not defined in vf_add_library(), a library is build regarding the CMAKE_BUILDY_TYPE.

Make the cmake project more flexible while removing the CMAKE_SOURCE_DIR usage.

Make the cmake project more flexible while removing the CMAKE_SOURCE_DIR usage.