Update repository

[mcflugen]

This pull request updates the model_metadata repository for Python 3.12, cleans up a lot of code, and removes a lot of unused code.

Given the large number of changes, I think this will require a bump in the package's major version. I take it back. I'm not ready to commit to no breaking changes.

[coveralls]

Pull Request Test Coverage Report for Build 7679898959

• -159 of 625 (74.56%) changed or added relevant lines in 13 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+72.8%) to 72.759%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/model_metadata/load.py	25	26	96.15%
src/model_metadata/modelmetadata.py	52	55	94.55%
src/model_metadata/main.py	0	4	0.0%
src/model_metadata/find.py	10	14	71.43%
src/model_metadata/model_info.py	37	47	78.72%
src/model_metadata/model_data_files.py	17	29	58.62%
src/model_metadata/model_setup.py	38	68	55.88%
src/model_metadata/main.py	103	138	74.64%
src/model_metadata/model_parameter.py	159	219	72.6%

Totals
Change from base Build 710659086:	72.8%
Covered Lines:	633
Relevant Lines:	870

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💛 - Coveralls