Library:
* Extensions and fixes for the visualization functions (PEtab-dev/PEtab255, PEtab-dev/PEtab262)
* Allow to extract fixed|free and scaled|non-scaled parameters (PEtab-dev/PEtab256, PEtab-dev/PEtab268, PEtab-dev/PEtab273)
* Various fixes (esp. PEtab-dev/PEtab264)
* Add function to get observable ids (PEtab-dev/PEtab269)
* Improve documentation (esp. PEtab-dev/PEtab289)
* Set default column for simulation results to 'simulation'
* Add support for COMBINE archives (PEtab-dev/PEtab271)
* Fix sbml observables to table
* Improve prior and dataframe tests (PEtab-dev/PEtab285, PEtab-dev/PEtab286, PEtab-dev/PEtab297)
* Add function to get parameter table with all default values (PEtab-dev/PEtab288)
* Move tests to github actions (PEtab-dev/PEtab281)
* Check for valid identifiers
* Fix handling of empty values in dataframes
* Allow to get numeric values in parameter mappings in scaled form (PEtab-dev/PEtab308)