Streamlit-qs

- Uses new st.query_params API
- Add update_qs and add_qs callbacks to example page. Allows all X_qs_callback functions to take no arguments by default.
- Resolves an issue with stqs.multiselect_qs where session_state would get updated even when no elements changed. Now session_state is only updated if the list of options we get from the query string _doesn't_ match what is already in session_state.

* Allow None default values/indices
* Widgets only pull values from the query string when they are first loaded on a per-session basis (whenever there isn't another value in session_state already), leading to a user experience more consistent with the standard streamlit widgets.
* add/update_qs_callback functions are renamed to better match what they actually do
* clear_qs_callback accepts optional arguments to only clear a certain subset of keys from the URL.
* string->value deserialization is inferred for some common OptionSequence types (ints, floats, Enums)
* Warnings are shown by default when using non-str OptionSequence types without an unformat_func (inferred or explicit)
* Reorganized the example.py demo

* Minor fixes to function type annotations
* Minor improvements to demo site (example.py)
* Additional unit tests for some of the private functions.

Install with `pip install streamlit-qs`.

**Full Changelog**: https://github.com/Asaurus1/streamlit-qs/compare/v0.1.1...v0.1.2

Initial Release of streamlit-qs

What's Changed
* Add makefile.yml for Makefile CI by Asaurus1 in https://github.com/Asaurus1/streamlit-qs/pull/1

New Contributors
* Asaurus1 made their first contribution in https://github.com/Asaurus1/streamlit-qs/pull/1

**Full Changelog**: https://github.com/Asaurus1/streamlit-qs/commits/v0.1.0