obs-scripting: Add support for multiple Python 3 versions

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This changes the way obs-scripting looks for and loads an available
Python 3 library. It tries to find a best possible version (starting
with Python 3.10) down to and including Python 3.6 by existing file
naming conventions and loads the most recent variant it can find.

User specified search path is either a Python installation directory
(Windows), or a Framework directory containing `Python.framework`
(macOS). The dll or dylib names are composed automatically.
The Python home path is also composed automatically on macOS (where
it has to point inside the Framework directory).

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