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

Update ci jobs to new image 1.1. Add clangd file to satisfy clangd when indexing cuda files. For the same reason disable cuda response files for includes.

Remove usage of GridFactory in main files.

See merge request irmb/VirtualFluids_dev!253

Fix bug in communicator pybinds

See merge request irmb/VirtualFluids_dev!252

Fix bug in pvtu file

Closes #116

See merge request irmb/VirtualFluids_dev!250

The data type in the .pvtu has to be same as in the .vtu file --> Float64

Update regression test with new reference data accordingly to https://git.rz.tu-bs.de/irmb/VirtualFluids_dev/-/merge_requests/209

Fix typo in numerical tests

See merge request irmb/VirtualFluids_dev!247

Unified Refinement (CF and FC) for gpu and cpu.

Closes #60

See merge request irmb/VirtualFluids_dev!209