Refactor ableton.py to be cleaner and extract methods into separate files

[sweep-ai]

Description

This PR refactors the ableton.py file to improve code organization and readability. Several functions have been extracted into a separate utility file, ableton_utils.py, to make the code cleaner and more maintainable. The global variables in ableton.py have been encapsulated into a class for better organization. The main() function has also been simplified by extracting some of its logic into separate functions.

Summary of Changes

• Extracted the functions say(text), switch_to_ableton(), and export(track, position) from ableton.py into ableton_utils.py.
• Encapsulated the global variables NAME, IS_RETINA, OS, PYTHON_EXEC, and STEMS into a class in ableton.py.
• Simplified the main() function in ableton.py by extracting some of its logic into separate functions.
• Created the ableton_utils.py file to contain the extracted utility functions.
• Improved code organization and readability in ableton.py.

Fixes #25.

To checkout this PR branch, run the following command in your terminal:

git checkout sweep/refactor-ableton-py