Pyspm

ipython 8.12 -> 8.16

- Bugfix for Bruker AFM issue as reported in 41

- Drop support for Python 3.9, which is currently in legacy status (if you need Python 3.9 support use `pySPM` version `0.5.2` (`pip install pySPM==0.5.2`)
- Significant code cleanup with extensive refactoring of library methods
- Lots of small improvements

This is a major release with a lot of changes, so please report any bugs you find!

Bugfix for non-square Bruker AFM files as reported in 38