Added
- Common function available from the top-level `import pymech as pm`
- Extras requirements to install `mayavi` and `rich` with
`pip install 'pymech[full]'`
- Experimental {func}`pymech.vtksuite.writevtk`
- Environment variable PYMECH_DEBUG to control logging level. See {mod}`pymech.log`
Changed
- Swap optional `colorlog` logger with `rich` in {mod}`pymech.log`
- Refresh {func}`pymech.vtksuite.exa2vtk` implementation on an experimental basis
Fixed
- Format entire code base with `black`
- Improve docs