Add gpu options to root cmake. Add the cmake option for passing the path to the numerial tests. Add git clone test to the CI.

Merge pull request 'Fix cuda::pow() bugfix, while passing doubles explicitly.' (#67) from peters/VirtualFluids_dev:bugfix/cuda_pow into develop

Reviewed-on: https://git.irmb.bau.tu-bs.de/VirtualFluids/VirtualFluids_dev/pulls/67

This pow-solution is not optimal but will work hopefully. The kernel performance will probably be decreased, because "double" calculations are 3-5 times slower compared to floating point operations.

According to the cuda documenation (https://docs.nvidia.com/cuda/cuda-math-api/group__CUDA__MATH__DOUBLE.html#group__CUDA__MATH__DOUBLE_1g6d36757715384dc18e0483aa1f04f6c7)
pow() gets two double arguments. With the newest VisualStudio Version 16.8 these arguments needs to be passed as double explicitly.

Set jobs to manual, as long the gitz gitlab has no windows runner and sonarqube is not transferred to one of the runners.

Merge pull request 'Enable shared and static lib support for VF gpu.' (#66) from peters/VirtualFluids_dev:feature/shared_libs_gpu into develop

Reviewed-on: https://git.irmb.bau.tu-bs.de/VirtualFluids/VirtualFluids_dev/pulls/66

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

Merge pull request 'Add job templates to the CI file.' (#64) from peters/VirtualFluids_dev:feature/ccache into develop

Reviewed-on: https://git.irmb.bau.tu-bs.de/VirtualFluids/VirtualFluids_dev/pulls/64