pyvista/pyvista: Feature and Support Improvements

This release adds a variety of new features, API changes, and documentation fixes. A big thanks to all who contributed to the PRs, issues, and testing for this release! New Features 3-lights illumination (#882) added clip_scalar (#877) Enable smooth shading for textures (#865) Add pathlib Support (#836) Enable status bars for the glyph filter (#779) clip closed surface for PolyData (#797) Add PolyData strip filter (#807) Add RubberBand2D interactor style (#872) Various documentation, spelling, and code cleanups: Add documentation on how to set up sphinx gallery (#783) Misc. documentation fixes (#829) Clarify clip filter docstring (#840) Add better Unstructured Grid Documentation (#845) Minor Examples Fixes (#852) typo fix (#864) Internationalization and localization of document. (#878) Add Filter Examples (#873) add section videos (#883) Bug fixes: Fix visible cell picking (#799) Fix get_data_range for nested MultiBlock (#793) Fix is_all_triangles (#832