[CPU] Clean CPU core

Based on the group discussion we cleaned up the cpu core library. This contains the renaming and deletion of the BoundaryConditions and Kernels as well as the deletion of unsued/old interpolation and applications.

https://git.rz.tu-bs.de/irmb/VirtualFluids_dev/-/issues/136

approved this merge request

added 2 commits

• 4f18dcea - Fix renamed kernel in python bindings.
• 429f57a3 - Fix bindings once more.

Compare with previous version

mentioned in commit 82c21746

merged

mentioned in issue #136 (closed)

mentioned in issue #143 (closed)