pyvista/pyvista: JOSS, name change, new features, bug fixes, and more!

This marks the release of a lot of new features since about v0.18.0. We've been under rapid development lately and these features are also comming with our review in the Journal of Open-Source Software (JOSS). Listed below are some notable changes.

Enhancements

• Updates to pyvista.rcParams
• Add lots more example data download functions (see #195)
• PolyData filters updates (see #194)
• Add .streamlines() filter (see #199)
• Add .interpolate() filter (see d0baf2c)
• Refactor keyword argument scale_factor to factor (see 367e5bb)
• Add support for string scalar arrays and better point labelling (see #200)
• Add MultiBlock.copy() method (see 1481696)
• Add MultiBlock negative indexing support (see 1481696)
• Enable default plotting theme environment variable (see 3aeb812)
• Add PolyData.extract_selection_points() filter (see #205)
• Add support for field data arrays (#207)
• Enhance __repr__ methods (see a86c3ff)
• Add box orientation axes widget (see #218)

Bugfixes

• Fix window closing bug on Windows (see #190)
• Fix SEGY reader import issue (see 8f52ddb)
• Fix broken file not found error message (see 5ccad7a)
• Fix scalar bar slot issue in multi plots (see 6235f57)
• RGB plotting bug-fix (see cf4e6cd)
• Fix plot texture example (#216)