[GPU] delete particle related code
All things related to Particles were removed in the merge request below. this includes allocations on the GPU and gpu calculations kernel.
- MR: https://git.rz.tu-bs.de/irmb/VirtualFluids_dev/-/merge_requests/322
- Commit: 2ee39085
- Parent: 5c33cca3
Edited by Sören Peters