Sigmaepsilon.mesh

Added

- Voxelization for triangular meshes as `sigmaepsilon.mesh.voxelize.voxelize_T3_H8`.
- Set operations for cells like `TET4_in_H8` etc. that can be used to calculate intersections for all kinds of meshes. The original reason behind these utilitiy functions is voxelization.

Changed

- Updated the capabilities of the PyVista plotter with new arguments for opacity, plot style and legend. See the details in the documentation for the `sigmaepsilon.mesh.plotting.pvplot.pvplot` function.

Fixed

- Fixed the voxelizer `sigmaepsilon.mesh.voxelize.voxelize_TET4_H8`. The new implementation is based on the separating axis theorem and is much more precise.

Added

- **Voxelization** in the direction H8 -> TET4

Removed

- **TetGen Dependency and Related Feature**: Removed functionality that was exclusively dependent on TetGen due to licensing incompatibility. TetGen is licensed under the GNU Affero General Public License v3 (AGPL-3.0), which is not compatible with our project's MIT license. This change ensures that our project remains compliant with the MIT license terms.

Notes

- Users who require the removed functionality can consider using TetGen directly in their own projects while complying with the AGPL-3.0 license. For more information on TetGen and its licensing, please visit the [TetGen project page](http://wias-berlin.de/software/tetgen/).

Added

- Protocols for PointData, CellData, PolyData and PolyCell classes
- Cell interpolators (7)

Fixed

- Copy and deepcopy operations (29).
- Cell class generation (36).

Changed

- Class architecture of data structures. Now the geometry is a nested class.

Removed

- Intermediate, unnecessary geometry classes.