Anystructure

What's Changed
* Excel input option
* Add load factor 1.1 for Machine Learning buckling (PULS based)
* Continuous update of Utilization Factor when updating pressure loads

* API introduced
* API documenatation at readthedocs (anystructure.readthedocs.io)
* GUI modifications
* Import of python package set to "anystruct"

* Corrected minor bug on membrane stresses for unstiffened cylinder.

* Corrected bug in loading old save files
* Corrected error on buckling flat plate calculation

* Reporting table on cylinders.
* Color coding on come cylinder properties.
* Corrected error on additional hoop stress input for cylinders.

* Corrected error on girder caluculation for cylinder buckling.
* Added 1.10 load factor option for cylinder buckling.
* Better compability with linux.
* Python 3.11 based.