Easyfea

- Moved `Display._Init_obj()` to `_simu._Init_obj()`.
- Updated the `Display.Plot_Result()` and `PyVista.Plot()` functions.
- Updated the `Modal1.py` and `Modal2.py` examples.
- Clarified the `_GroupElem.Get_F_e_pg()` and `_GroupElem.Get_invF_e_pg()` functions.

- Created the MeshIO interface.
- Updated the Geoms module.
- Created the params check functions.

- Updated pyproject.toml (name = "easyfea") to comply with PyPI distribution format specifications.
- Enhanced Gmsh_Interface to support linked surface creation by adding pointTags to the addSurfaceFilling function in Gmsh.

- Updated Folder functions (New_File -> Join(mkdir=True), Get_Path() -> Dir())
- Removed colors in Display.Plot_Tags()
- Updated the method for setting up a tag in a mesh (_Set_Nodes_Tag and _Set_Elements_Tag).
- Removed the old trick to generate the mesh with gmsh recombine
- Updated Gmsh_Interface tests (test_mesh_isOrganised).
- Enhanced examples.

- Implemented new element types: QUAD9, SEG5, TRI15, HEXA27, PRISM18.
- Enhanced Gmsh_Interface for QUAD and HEXA elements.
- Standardized shape functions.
- Updated Paraview_Interface and PyVista_Interface.
- Updated Gauss points quadrature.
- Migrated from unittest to pytest.
- Enhanced examples.

- Enhanced Gmsh_Interface.
- Finite element shape functions were renamed to improve code readability.
- NEW YEAR.