Starsim

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- Refactor distributions to use new Distribution class
- *GitHub info*: PR `112 <https://github.com/amath-idm/stisim/pull/112>`_

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- Changes agent IDs from index-based to UID-based
- Allows states to store their own data and live within modules
- *GitHub info*: PR `88 <https://github.com/amath-idm/stisim/pull/88>`_

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- Refactor file structure
- *GitHub info*: PRs `77 <https://github.com/amath-idm/stisim/pull/77>`_ and `86 <https://github.com/amath-idm/stisim/pull/86>`_

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- Adds in basic Starsim functionality
- *GitHub info*: PR `17 <https://github.com/amath-idm/stisim/pull/17>`__

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- Initial version.