Py-modelrunner

Switch to pyproject.toml and setuptools_scm, requiring a new version model.

What's Changed
* Improved docstrings by david-zwicker in https://github.com/zwicker-group/py-modelrunner/pull/14
* Fixed set_default, so it can also be used as a decorator by david-zwicker in https://github.com/zwicker-group/py-modelrunner/pull/15
* Switch to using pyproject.toml by david-zwicker in https://github.com/zwicker-group/py-modelrunner/pull/17
* Set version number automatically by david-zwicker in https://github.com/zwicker-group/py-modelrunner/pull/18


**Full Changelog**: https://github.com/zwicker-group/py-modelrunner/compare/v0.8...0.9

What's Changed
* Allow setting default model by david-zwicker in https://github.com/zwicker-group/py-modelrunner/pull/13

**Full Changelog**: https://github.com/zwicker-group/py-modelrunner/compare/v0.7...v0.8

What's Changed
* Added flag `use_modelrunner`, which can be disabled to run bare scripts by david-zwicker in https://github.com/zwicker-group/py-modelrunner/pull/12


**Full Changelog**: https://github.com/zwicker-group/py-modelrunner/compare/v0.6...v0.7

What's Changed
* Include more files during setup by david-zwicker in https://github.com/zwicker-group/py-modelrunner/pull/11


**Full Changelog**: https://github.com/zwicker-group/py-modelrunner/compare/v0.5...v0.6

**Full Changelog**: https://github.com/zwicker-group/py-modelrunner/compare/v0.4...v0.5