* Significantly faster launch of ``ov`` CLI commands
* Python 3.8 is the minimum Python version requirement.
* Refactored codes.
* ``ov run`` and other CLI commands can have ``--md`` option to fix https://github.com/KarchinLab/open-cravat/issues/112.
* The PyPI packages required for a module can be defined with ``requires_pypi`` field in the module's ``yml`` file and they will be automatically installed with ``ov module install``.
* All secondary input fields, including those with ``None`` value, will be provided to annotator modules' ``annotate`` function for consistency in handling them.