python-ballcosmos 2.0

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Hello Everybody,

I made some large changes to the library from 0.1.0, 1.0.0, 1.1.0 to now 2.0.0. These changes make it easier to use and maintain, but want to make sure I am improving the functionality of the library and as always open to community feedback. Give the new master/main branch a try and let me know if you find any issues.