v0.0.4

1. Separated domain validation from the main code.
2. Created the geometry module with basic line-related and point-related functions, as well as ConvexCone class, Hyperplane class, AbstractPolytope class with Polytope2D simplification.
3. Added built-in visualizations.
4. Simplified add_matrices.
5. Implemented the basic version of eigenvalue and eigenvector -- to be extended.
6. Added mult_arrays -- tropical tensor multiplication for NumPy arrays.
7. get_hyperplanes -> get_linear_hyperplanes in polynomials.