Remove old apps. Remove unused extensions. Add format checker extensions and flylint settings to workspace. Add multigpu build to all-apps.

Necessary after https://git.rz.tu-bs.de/irmb/VirtualFluids_dev/-/merge_requests/253

Extract Scaling and interpolation from CF Interpolation to generalize this behavior for CPU and GPU.

probably needed because of 201a9e1f

lower the reynolds number to avoid possible problems with the random nature of turbulent flows