ccx2paraview v3.2.0

• Added PyPi publishing workflow

• Turned into installable package

• Made the development version installable by pip

• Added alias scripts for converting to formats

• Improvements in von Mises and principal stress calculations

• Added description in readme: how to convert to a vtkhdf-file

• Added Exception message indicating missing vtk-dependency

• Streamline import of Converter (i.e. from ccx2paraview import Converter)

• Fixed syntax warning invalid escape sequence

• Fixed broken pvd-file (missing '.' in '.vtu')

Big thanks to @soylentOrange, @fsimonis and @rsmith-nl for working on this release.